﻿// Knockout JavaScript library v2.2.1
// (c) Steven Sanderson - http://knockoutjs.com/
// License: MIT (http://www.opensource.org/licenses/mit-license.php)

(function () {
    var DEBUG = true;
    (function (window, document, navigator, jQuery, undefined) {
        !function (factory) {
            // Support three module loading scenarios
            if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
                // [1] CommonJS/Node.js
                var target = module['exports'] || exports; // module.exports is for Node.js
                factory(target);
            } else if (typeof define === 'function' && define['amd']) {
                // [2] AMD anonymous module
                define(['exports'], factory);
            } else {
                // [3] No module loader (plain <script> tag) - put directly in global namespace
                factory(window['ko'] = {});
            }
        }(function (koExports) {
            // Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
            // In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
            var ko = typeof koExports !== 'undefined' ? koExports : {};
            // Google Closure Compiler helpers (used only to make the minified file smaller)
            ko.exportSymbol = function (koPath, object) {
                var tokens = koPath.split(".");

                // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
                // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
                var target = ko;

                for (var i = 0; i < tokens.length - 1; i++)
                    target = target[tokens[i]];
                target[tokens[tokens.length - 1]] = object;
            };
            ko.exportProperty = function (owner, publicName, object) {
                owner[publicName] = object;
            };
            ko.version = "2.2.1";

            ko.exportSymbol('version', ko.version);
            ko.utils = new (function () {
                var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;

                // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
                var knownEvents = {}, knownEventTypesByEventName = {};
                var keyEventTypeName = /Firefox\/2/i.test(navigator.userAgent) ? 'KeyboardEvent' : 'UIEvents';
                knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
                knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
                for (var eventType in knownEvents) {
                    var knownEventsForType = knownEvents[eventType];
                    if (knownEventsForType.length) {
                        for (var i = 0, j = knownEventsForType.length; i < j; i++)
                            knownEventTypesByEventName[knownEventsForType[i]] = eventType;
                    }
                }
                var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406

                // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
                // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
                // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
                // If there is a future need to detect specific versions of IE10+, we will amend this.
                var ieVersion = (function () {
                    var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');

                    // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
                    while (
                        div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
                        iElems[0]
                    );
                    return version > 4 ? version : undefined;
                }());
                var isIe6 = ieVersion === 6,
                    isIe7 = ieVersion === 7;

                function isClickOnCheckableElement(element, eventType) {
                    if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
                    if (eventType.toLowerCase() != "click") return false;
                    var inputType = element.type;
                    return (inputType == "checkbox") || (inputType == "radio");
                }

                return {
                    fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],

                    arrayForEach: function (array, action) {
                        for (var i = 0, j = array.length; i < j; i++)
                            action(array[i]);
                    },

                    arrayIndexOf: function (array, item) {
                        if (typeof Array.prototype.indexOf == "function")
                            return Array.prototype.indexOf.call(array, item);
                        for (var i = 0, j = array.length; i < j; i++)
                            if (array[i] === item)
                                return i;
                        return -1;
                    },

                    arrayFirst: function (array, predicate, predicateOwner) {
                        for (var i = 0, j = array.length; i < j; i++)
                            if (predicate.call(predicateOwner, array[i]))
                                return array[i];
                        return null;
                    },

                    arrayRemoveItem: function (array, itemToRemove) {
                        var index = ko.utils.arrayIndexOf(array, itemToRemove);
                        if (index >= 0)
                            array.splice(index, 1);
                    },

                    arrayGetDistinctValues: function (array) {
                        array = array || [];
                        var result = [];
                        for (var i = 0, j = array.length; i < j; i++) {
                            if (ko.utils.arrayIndexOf(result, array[i]) < 0)
                                result.push(array[i]);
                        }
                        return result;
                    },

                    arrayMap: function (array, mapping) {
                        array = array || [];
                        var result = [];
                        for (var i = 0, j = array.length; i < j; i++)
                            result.push(mapping(array[i]));
                        return result;
                    },

                    arrayFilter: function (array, predicate) {
                        array = array || [];
                        var result = [];
                        for (var i = 0, j = array.length; i < j; i++)
                            if (predicate(array[i]))
                                result.push(array[i]);
                        return result;
                    },

                    arrayPushAll: function (array, valuesToPush) {
                        if (valuesToPush instanceof Array)
                            array.push.apply(array, valuesToPush);
                        else
                            for (var i = 0, j = valuesToPush.length; i < j; i++)
                                array.push(valuesToPush[i]);
                        return array;
                    },

                    extend: function (target, source) {
                        if (source) {
                            for (var prop in source) {
                                if (source.hasOwnProperty(prop)) {
                                    target[prop] = source[prop];
                                }
                            }
                        }
                        return target;
                    },

                    emptyDomNode: function (domNode) {
                        while (domNode.firstChild) {
                            ko.removeNode(domNode.firstChild);
                        }
                    },

                    moveCleanedNodesToContainerElement: function (nodes) {
                        // Ensure it's a real array, as we're about to reparent the nodes and
                        // we don't want the underlying collection to change while we're doing that.
                        var nodesArray = ko.utils.makeArray(nodes);

                        var container = document.createElement('div');
                        for (var i = 0, j = nodesArray.length; i < j; i++) {
                            container.appendChild(ko.cleanNode(nodesArray[i]));
                        }
                        return container;
                    },

                    cloneNodes: function (nodesArray, shouldCleanNodes) {
                        for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
                            var clonedNode = nodesArray[i].cloneNode(true);
                            newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
                        }
                        return newNodesArray;
                    },

                    setDomNodeChildren: function (domNode, childNodes) {
                        ko.utils.emptyDomNode(domNode);
                        if (childNodes) {
                            for (var i = 0, j = childNodes.length; i < j; i++)
                                domNode.appendChild(childNodes[i]);
                        }
                    },

                    replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
                        var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
                        if (nodesToReplaceArray.length > 0) {
                            var insertionPoint = nodesToReplaceArray[0];
                            var parent = insertionPoint.parentNode;
                            for (var i = 0, j = newNodesArray.length; i < j; i++)
                                parent.insertBefore(newNodesArray[i], insertionPoint);
                            for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
                                ko.removeNode(nodesToReplaceArray[i]);
                            }
                        }
                    },

                    setOptionNodeSelectionState: function (optionNode, isSelected) {
                        // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
                        if (ieVersion < 7)
                            optionNode.setAttribute("selected", isSelected);
                        else
                            optionNode.selected = isSelected;
                    },

                    stringTrim: function (string) {
                        return (string || "").replace(stringTrimRegex, "");
                    },

                    stringTokenize: function (string, delimiter) {
                        var result = [];
                        var tokens = (string || "").split(delimiter);
                        for (var i = 0, j = tokens.length; i < j; i++) {
                            var trimmed = ko.utils.stringTrim(tokens[i]);
                            if (trimmed !== "")
                                result.push(trimmed);
                        }
                        return result;
                    },

                    stringStartsWith: function (string, startsWith) {
                        string = string || "";
                        if (startsWith.length > string.length)
                            return false;
                        return string.substring(0, startsWith.length) === startsWith;
                    },

                    domNodeIsContainedBy: function (node, containedByNode) {
                        if (containedByNode.compareDocumentPosition)
                            return (containedByNode.compareDocumentPosition(node) & 16) == 16;
                        while (node != null) {
                            if (node == containedByNode)
                                return true;
                            node = node.parentNode;
                        }
                        return false;
                    },

                    domNodeIsAttachedToDocument: function (node) {
                        return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
                    },

                    tagNameLower: function (element) {
                        // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
                        // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
                        // we don't need to do the .toLowerCase() as it will always be lower case anyway.
                        return element && element.tagName && element.tagName.toLowerCase();
                    },

                    registerEventHandler: function (element, eventType, handler) {
                        var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
                        if (!mustUseAttachEvent && typeof jQuery != "undefined") {
                            if (isClickOnCheckableElement(element, eventType)) {
                                // For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
                                // it toggles the element checked state *after* the click event handlers run, whereas native
                                // click events toggle the checked state *before* the event handler.
                                // Fix this by intecepting the handler and applying the correct checkedness before it runs.
                                var originalHandler = handler;
                                handler = function (event, eventData) {
                                    var jQuerySuppliedCheckedState = this.checked;
                                    if (eventData)
                                        this.checked = eventData.checkedStateBeforeEvent !== true;
                                    originalHandler.call(this, event);
                                    this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
                                };
                            }
                            jQuery(element)['bind'](eventType, handler);
                        } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
                            element.addEventListener(eventType, handler, false);
                        else if (typeof element.attachEvent != "undefined")
                            element.attachEvent("on" + eventType, function (event) {
                                handler.call(element, event);
                            });
                        else
                            throw new Error("Browser doesn't support addEventListener or attachEvent");
                    },

                    triggerEvent: function (element, eventType) {
                        if (!(element && element.nodeType))
                            throw new Error("element must be a DOM node when calling triggerEvent");

                        if (typeof jQuery != "undefined") {
                            var eventData = [];
                            if (isClickOnCheckableElement(element, eventType)) {
                                // Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
                                eventData.push({ checkedStateBeforeEvent: element.checked });
                            }
                            jQuery(element)['trigger'](eventType, eventData);
                        } else if (typeof document.createEvent == "function") {
                            if (typeof element.dispatchEvent == "function") {
                                var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
                                var event = document.createEvent(eventCategory);
                                event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
                                element.dispatchEvent(event);
                            }
                            else
                                throw new Error("The supplied element doesn't support dispatchEvent");
                        } else if (typeof element.fireEvent != "undefined") {
                            // Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
                            // so to make it consistent, we'll do it manually here
                            if (isClickOnCheckableElement(element, eventType))
                                element.checked = element.checked !== true;
                            element.fireEvent("on" + eventType);
                        }
                        else
                            throw new Error("Browser doesn't support triggering events");
                    },

                    unwrapObservable: function (value) {
                        return ko.isObservable(value) ? value() : value;
                    },

                    peekObservable: function (value) {
                        return ko.isObservable(value) ? value.peek() : value;
                    },

                    toggleDomNodeCssClass: function (node, classNames, shouldHaveClass) {
                        if (classNames) {
                            var cssClassNameRegex = /[\w-]+/g,
                                currentClassNames = node.className.match(cssClassNameRegex) || [];
                            ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function (className) {
                                var indexOfClass = ko.utils.arrayIndexOf(currentClassNames, className);
                                if (indexOfClass >= 0) {
                                    if (!shouldHaveClass)
                                        currentClassNames.splice(indexOfClass, 1);
                                } else {
                                    if (shouldHaveClass)
                                        currentClassNames.push(className);
                                }
                            });
                            node.className = currentClassNames.join(" ");
                        }
                    },

                    setTextContent: function (element, textContent) {
                        var value = ko.utils.unwrapObservable(textContent);
                        if ((value === null) || (value === undefined))
                            value = "";

                        if (element.nodeType === 3) {
                            element.data = value;
                        } else {
                            // We need there to be exactly one child: a text node.
                            // If there are no children, more than one, or if it's not a text node,
                            // we'll clear everything and create a single text node.
                            var innerTextNode = ko.virtualElements.firstChild(element);
                            if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
                                ko.virtualElements.setDomNodeChildren(element, [document.createTextNode(value)]);
                            } else {
                                innerTextNode.data = value;
                            }

                            ko.utils.forceRefresh(element);
                        }
                    },

                    setElementName: function (element, name) {
                        element.name = name;

                        // Workaround IE 6/7 issue
                        // - https://github.com/SteveSanderson/knockout/issues/197
                        // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
                        if (ieVersion <= 7) {
                            try {
                                element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
                            }
                            catch (e) { } // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
                        }
                    },

                    forceRefresh: function (node) {
                        // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
                        if (ieVersion >= 9) {
                            // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
                            var elem = node.nodeType == 1 ? node : node.parentNode;
                            if (elem.style)
                                elem.style.zoom = elem.style.zoom;
                        }
                    },

                    ensureSelectElementIsRenderedCorrectly: function (selectElement) {
                        // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
                        // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
                        if (ieVersion >= 9) {
                            var originalWidth = selectElement.style.width;
                            selectElement.style.width = 0;
                            selectElement.style.width = originalWidth;
                        }
                    },

                    range: function (min, max) {
                        min = ko.utils.unwrapObservable(min);
                        max = ko.utils.unwrapObservable(max);
                        var result = [];
                        for (var i = min; i <= max; i++)
                            result.push(i);
                        return result;
                    },

                    makeArray: function (arrayLikeObject) {
                        var result = [];
                        for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
                            result.push(arrayLikeObject[i]);
                        };
                        return result;
                    },

                    isIe6: isIe6,
                    isIe7: isIe7,
                    ieVersion: ieVersion,

                    getFormFields: function (form, fieldName) {
                        var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
                        var isMatchingField = (typeof fieldName == 'string')
                            ? function (field) { return field.name === fieldName }
                            : function (field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
                        var matches = [];
                        for (var i = fields.length - 1; i >= 0; i--) {
                            if (isMatchingField(fields[i]))
                                matches.push(fields[i]);
                        };
                        return matches;
                    },

                    parseJson: function (jsonString) {
                        if (typeof jsonString == "string") {
                            jsonString = ko.utils.stringTrim(jsonString);
                            if (jsonString) {
                                if (window.JSON && window.JSON.parse) // Use native parsing where available
                                    return window.JSON.parse(jsonString);
                                return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
                            }
                        }
                        return null;
                    },

                    stringifyJson: function (data, replacer, space) {   // replacer and space are optional
                        if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
                            throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
                        return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
                    },

                    postJson: function (urlOrForm, data, options) {
                        options = options || {};
                        var params = options['params'] || {};
                        var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
                        var url = urlOrForm;

                        // If we were given a form, use its 'action' URL and pick out any requested field values
                        if ((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
                            var originalForm = urlOrForm;
                            url = originalForm.action;
                            for (var i = includeFields.length - 1; i >= 0; i--) {
                                var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
                                for (var j = fields.length - 1; j >= 0; j--)
                                    params[fields[j].name] = fields[j].value;
                            }
                        }

                        data = ko.utils.unwrapObservable(data);
                        var form = document.createElement("form");
                        form.style.display = "none";
                        form.action = url;
                        form.method = "post";
                        for (var key in data) {
                            var input = document.createElement("input");
                            input.name = key;
                            input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
                            form.appendChild(input);
                        }
                        for (var key in params) {
                            var input = document.createElement("input");
                            input.name = key;
                            input.value = params[key];
                            form.appendChild(input);
                        }
                        document.body.appendChild(form);
                        options['submitter'] ? options['submitter'](form) : form.submit();
                        setTimeout(function () { form.parentNode.removeChild(form); }, 0);
                    }
                }
            })();

            ko.exportSymbol('utils', ko.utils);
            ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
            ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
            ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
            ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
            ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
            ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
            ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
            ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
            ko.exportSymbol('utils.extend', ko.utils.extend);
            ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
            ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
            ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
            ko.exportSymbol('utils.postJson', ko.utils.postJson);
            ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
            ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
            ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
            ko.exportSymbol('utils.range', ko.utils.range);
            ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
            ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
            ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);

            if (!Function.prototype['bind']) {
                // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
                // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
                Function.prototype['bind'] = function (object) {
                    var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
                    return function () {
                        return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
                    };
                };
            }

            ko.utils.domData = new (function () {
                var uniqueId = 0;
                var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
                var dataStore = {};
                return {
                    get: function (node, key) {
                        var allDataForNode = ko.utils.domData.getAll(node, false);
                        return allDataForNode === undefined ? undefined : allDataForNode[key];
                    },
                    set: function (node, key, value) {
                        if (value === undefined) {
                            // Make sure we don't actually create a new domData key if we are actually deleting a value
                            if (ko.utils.domData.getAll(node, false) === undefined)
                                return;
                        }
                        var allDataForNode = ko.utils.domData.getAll(node, true);
                        allDataForNode[key] = value;
                    },
                    getAll: function (node, createIfNotFound) {
                        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
                        var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
                        if (!hasExistingDataStore) {
                            if (!createIfNotFound)
                                return undefined;
                            dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
                            dataStore[dataStoreKey] = {};
                        }
                        return dataStore[dataStoreKey];
                    },
                    clear: function (node) {
                        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
                        if (dataStoreKey) {
                            delete dataStore[dataStoreKey];
                            node[dataStoreKeyExpandoPropertyName] = null;
                            return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
                        }
                        return false;
                    }
                }
            })();

            ko.exportSymbol('utils.domData', ko.utils.domData);
            ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully

            ko.utils.domNodeDisposal = new (function () {
                var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
                var cleanableNodeTypes = { 1: true, 8: true, 9: true };       // Element, Comment, Document
                var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document

                function getDisposeCallbacksCollection(node, createIfNotFound) {
                    var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
                    if ((allDisposeCallbacks === undefined) && createIfNotFound) {
                        allDisposeCallbacks = [];
                        ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
                    }
                    return allDisposeCallbacks;
                }
                function destroyCallbacksCollection(node) {
                    ko.utils.domData.set(node, domDataKey, undefined);
                }

                function cleanSingleNode(node) {
                    // Run all the dispose callbacks
                    var callbacks = getDisposeCallbacksCollection(node, false);
                    if (callbacks) {
                        callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
                        for (var i = 0; i < callbacks.length; i++)
                            callbacks[i](node);
                    }

                    // Also erase the DOM data
                    ko.utils.domData.clear(node);

                    // Special support for jQuery here because it's so commonly used.
                    // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
                    // so notify it to tear down any resources associated with the node & descendants here.
                    if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
                        jQuery['cleanData']([node]);

                    // Also clear any immediate-child comment nodes, as these wouldn't have been found by
                    // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
                    if (cleanableNodeTypesWithDescendants[node.nodeType])
                        cleanImmediateCommentTypeChildren(node);
                }

                function cleanImmediateCommentTypeChildren(nodeWithChildren) {
                    var child, nextChild = nodeWithChildren.firstChild;
                    while (child = nextChild) {
                        nextChild = child.nextSibling;
                        if (child.nodeType === 8)
                            cleanSingleNode(child);
                    }
                }

                return {
                    addDisposeCallback: function (node, callback) {
                        if (typeof callback != "function")
                            throw new Error("Callback must be a function");
                        getDisposeCallbacksCollection(node, true).push(callback);
                    },

                    removeDisposeCallback: function (node, callback) {
                        var callbacksCollection = getDisposeCallbacksCollection(node, false);
                        if (callbacksCollection) {
                            ko.utils.arrayRemoveItem(callbacksCollection, callback);
                            if (callbacksCollection.length == 0)
                                destroyCallbacksCollection(node);
                        }
                    },

                    cleanNode: function (node) {
                        // First clean this node, where applicable
                        if (cleanableNodeTypes[node.nodeType]) {
                            cleanSingleNode(node);

                            // ... then its descendants, where applicable
                            if (cleanableNodeTypesWithDescendants[node.nodeType]) {
                                // Clone the descendants list in case it changes during iteration
                                var descendants = [];
                                ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
                                for (var i = 0, j = descendants.length; i < j; i++)
                                    cleanSingleNode(descendants[i]);
                            }
                        }
                        return node;
                    },

                    removeNode: function (node) {
                        ko.cleanNode(node);
                        if (node.parentNode)
                            node.parentNode.removeChild(node);
                    }
                }
            })();
            ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
            ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
            ko.exportSymbol('cleanNode', ko.cleanNode);
            ko.exportSymbol('removeNode', ko.removeNode);
            ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
            ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
            ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
            (function () {
                var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;

                function simpleHtmlParse(html) {
                    // Based on jQuery's "clean" function, but only accounting for table-related elements.
                    // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly

                    // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
                    // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
                    // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
                    // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.

                    // Trim whitespace, otherwise indexOf won't work as expected
                    var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");

                    // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
                    var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
                               !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
                               (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
                               /* anything else */[0, "", ""];

                    // Go to html and back, then peel off extra wrappers
                    // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
                    var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
                    if (typeof window['innerShiv'] == "function") {
                        div.appendChild(window['innerShiv'](markup));
                    } else {
                        div.innerHTML = markup;
                    }

                    // Move to the right depth
                    while (wrap[0]--)
                        div = div.lastChild;

                    return ko.utils.makeArray(div.lastChild.childNodes);
                }

                function jQueryHtmlParse(html) {
                    // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
                    if (jQuery['parseHTML']) {
                        return jQuery['parseHTML'](html);
                    } else {
                        // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
                        var elems = jQuery['clean']([html]);

                        // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
                        // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
                        // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
                        if (elems && elems[0]) {
                            // Find the top-most parent element that's a direct child of a document fragment
                            var elem = elems[0];
                            while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
                                elem = elem.parentNode;
                            // ... then detach it
                            if (elem.parentNode)
                                elem.parentNode.removeChild(elem);
                        }

                        return elems;
                    }
                }

                ko.utils.parseHtmlFragment = function (html) {
                    return typeof jQuery != 'undefined' ? jQueryHtmlParse(html)   // As below, benefit from jQuery's optimisations where possible
                                                        : simpleHtmlParse(html);  // ... otherwise, this simple logic will do in most common cases.
                };

                ko.utils.setHtml = function (node, html) {
                    ko.utils.emptyDomNode(node);

                    // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
                    html = ko.utils.unwrapObservable(html);

                    if ((html !== null) && (html !== undefined)) {
                        if (typeof html != 'string')
                            html = html.toString();

                        // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
                        // for example <tr> elements which are not normally allowed to exist on their own.
                        // If you've referenced jQuery we'll use that rather than duplicating its code.
                        if (typeof jQuery != 'undefined') {
                            jQuery(node)['html'](html);
                        } else {
                            // ... otherwise, use KO's own parsing logic.
                            var parsedNodes = ko.utils.parseHtmlFragment(html);
                            for (var i = 0; i < parsedNodes.length; i++)
                                node.appendChild(parsedNodes[i]);
                        }
                    }
                };
            })();

            ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
            ko.exportSymbol('utils.setHtml', ko.utils.setHtml);

            ko.memoization = (function () {
                var memos = {};

                function randomMax8HexChars() {
                    return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
                }
                function generateRandomId() {
                    return randomMax8HexChars() + randomMax8HexChars();
                }
                function findMemoNodes(rootNode, appendToArray) {
                    if (!rootNode)
                        return;
                    if (rootNode.nodeType == 8) {
                        var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
                        if (memoId != null)
                            appendToArray.push({ domNode: rootNode, memoId: memoId });
                    } else if (rootNode.nodeType == 1) {
                        for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
                            findMemoNodes(childNodes[i], appendToArray);
                    }
                }

                return {
                    memoize: function (callback) {
                        if (typeof callback != "function")
                            throw new Error("You can only pass a function to ko.memoization.memoize()");
                        var memoId = generateRandomId();
                        memos[memoId] = callback;
                        return "<!--[ko_memo:" + memoId + "]-->";
                    },

                    unmemoize: function (memoId, callbackParams) {
                        var callback = memos[memoId];
                        if (callback === undefined)
                            throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
                        try {
                            callback.apply(null, callbackParams || []);
                            return true;
                        }
                        finally { delete memos[memoId]; }
                    },

                    unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
                        var memos = [];
                        findMemoNodes(domNode, memos);
                        for (var i = 0, j = memos.length; i < j; i++) {
                            var node = memos[i].domNode;
                            var combinedParams = [node];
                            if (extraCallbackParamsArray)
                                ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
                            ko.memoization.unmemoize(memos[i].memoId, combinedParams);
                            node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
                            if (node.parentNode)
                                node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
                        }
                    },

                    parseMemoText: function (memoText) {
                        var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
                        return match ? match[1] : null;
                    }
                };
            })();

            ko.exportSymbol('memoization', ko.memoization);
            ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
            ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
            ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
            ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
            ko.extenders = {
                'throttle': function (target, timeout) {
                    // Throttling means two things:

                    // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
                    //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
                    target['throttleEvaluation'] = timeout;

                    // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
                    //     so the target cannot change value synchronously or faster than a certain rate
                    var writeTimeoutInstance = null;
                    return ko.dependentObservable({
                        'read': target,
                        'write': function (value) {
                            clearTimeout(writeTimeoutInstance);
                            writeTimeoutInstance = setTimeout(function () {
                                target(value);
                            }, timeout);
                        }
                    });
                },

                'notify': function (target, notifyWhen) {
                    target["equalityComparer"] = notifyWhen == "always"
                        ? function () { return false } // Treat all values as not equal
                        : ko.observable["fn"]["equalityComparer"];
                    return target;
                }
            };

            function applyExtenders(requestedExtenders) {
                var target = this;
                if (requestedExtenders) {
                    for (var key in requestedExtenders) {
                        var extenderHandler = ko.extenders[key];
                        if (typeof extenderHandler == 'function') {
                            target = extenderHandler(target, requestedExtenders[key]);
                        }
                    }
                }
                return target;
            }

            ko.exportSymbol('extenders', ko.extenders);

            ko.subscription = function (target, callback, disposeCallback) {
                this.target = target;
                this.callback = callback;
                this.disposeCallback = disposeCallback;
                ko.exportProperty(this, 'dispose', this.dispose);
            };
            ko.subscription.prototype.dispose = function () {
                this.isDisposed = true;
                this.disposeCallback();
            };

            ko.subscribable = function () {
                this._subscriptions = {};

                ko.utils.extend(this, ko.subscribable['fn']);
                ko.exportProperty(this, 'subscribe', this.subscribe);
                ko.exportProperty(this, 'extend', this.extend);
                ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
            }

            var defaultEvent = "change";

            ko.subscribable['fn'] = {
                subscribe: function (callback, callbackTarget, event) {
                    event = event || defaultEvent;
                    var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;

                    var subscription = new ko.subscription(this, boundCallback, function () {
                        ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
                    }.bind(this));

                    if (!this._subscriptions[event])
                        this._subscriptions[event] = [];
                    this._subscriptions[event].push(subscription);
                    return subscription;
                },

                "notifySubscribers": function (valueToNotify, event) {
                    event = event || defaultEvent;
                    if (this._subscriptions[event]) {
                        ko.dependencyDetection.ignore(function () {
                            ko.utils.arrayForEach(this._subscriptions[event].slice(0), function (subscription) {
                                // In case a subscription was disposed during the arrayForEach cycle, check
                                // for isDisposed on each subscription before invoking its callback
                                if (subscription && (subscription.isDisposed !== true))
                                    subscription.callback(valueToNotify);
                            });
                        }, this);
                    }
                },

                getSubscriptionsCount: function () {
                    var total = 0;
                    for (var eventName in this._subscriptions) {
                        if (this._subscriptions.hasOwnProperty(eventName))
                            total += this._subscriptions[eventName].length;
                    }
                    return total;
                },

                extend: applyExtenders
            };


            ko.isSubscribable = function (instance) {
                return typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
            };

            ko.exportSymbol('subscribable', ko.subscribable);
            ko.exportSymbol('isSubscribable', ko.isSubscribable);

            ko.dependencyDetection = (function () {
                var _frames = [];

                return {
                    begin: function (callback) {
                        _frames.push({ callback: callback, distinctDependencies: [] });
                    },

                    end: function () {
                        _frames.pop();
                    },

                    registerDependency: function (subscribable) {
                        if (!ko.isSubscribable(subscribable))
                            throw new Error("Only subscribable things can act as dependencies");
                        if (_frames.length > 0) {
                            var topFrame = _frames[_frames.length - 1];
                            if (!topFrame || ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
                                return;
                            topFrame.distinctDependencies.push(subscribable);
                            topFrame.callback(subscribable);
                        }
                    },

                    ignore: function (callback, callbackTarget, callbackArgs) {
                        try {
                            _frames.push(null);
                            return callback.apply(callbackTarget, callbackArgs || []);
                        } finally {
                            _frames.pop();
                        }
                    }
                };
            })();
            var primitiveTypes = { 'undefined': true, 'boolean': true, 'number': true, 'string': true };

            ko.observable = function (initialValue) {
                var _latestValue = initialValue;

                function observable() {
                    if (arguments.length > 0) {
                        // Write

                        // Ignore writes if the value hasn't changed
                        if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
                            observable.valueWillMutate();
                            _latestValue = arguments[0];
                            if (DEBUG) observable._latestValue = _latestValue;
                            observable.valueHasMutated();
                        }
                        return this; // Permits chained assignments
                    }
                    else {
                        // Read
                        ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
                        return _latestValue;
                    }
                }
                if (DEBUG) observable._latestValue = _latestValue;
                ko.subscribable.call(observable);
                observable.peek = function () { return _latestValue };
                observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
                observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
                ko.utils.extend(observable, ko.observable['fn']);

                ko.exportProperty(observable, 'peek', observable.peek);
                ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
                ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);

                return observable;
            }

            ko.observable['fn'] = {
                "equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
                    var oldValueIsPrimitive = (a === null) || (typeof (a) in primitiveTypes);
                    return oldValueIsPrimitive ? (a === b) : false;
                }
            };

            var protoProperty = ko.observable.protoProperty = "__ko_proto__";
            ko.observable['fn'][protoProperty] = ko.observable;

            ko.hasPrototype = function (instance, prototype) {
                if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
                if (instance[protoProperty] === prototype) return true;
                return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
            };

            ko.isObservable = function (instance) {
                return ko.hasPrototype(instance, ko.observable);
            }
            ko.isWriteableObservable = function (instance) {
                // Observable
                if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
                    return true;
                // Writeable dependent observable
                if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
                    return true;
                // Anything else
                return false;
            }


            ko.exportSymbol('observable', ko.observable);
            ko.exportSymbol('isObservable', ko.isObservable);
            ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
            ko.observableArray = function (initialValues) {
                if (arguments.length == 0) {
                    // Zero-parameter constructor initializes to empty array
                    initialValues = [];
                }
                if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
                    throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");

                var result = ko.observable(initialValues);
                ko.utils.extend(result, ko.observableArray['fn']);
                return result;
            }

            ko.observableArray['fn'] = {
                'remove': function (valueOrPredicate) {
                    var underlyingArray = this.peek();
                    var removedValues = [];
                    var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
                    for (var i = 0; i < underlyingArray.length; i++) {
                        var value = underlyingArray[i];
                        if (predicate(value)) {
                            if (removedValues.length === 0) {
                                this.valueWillMutate();
                            }
                            removedValues.push(value);
                            underlyingArray.splice(i, 1);
                            i--;
                        }
                    }
                    if (removedValues.length) {
                        this.valueHasMutated();
                    }
                    return removedValues;
                },

                'removeAll': function (arrayOfValues) {
                    // If you passed zero args, we remove everything
                    if (arrayOfValues === undefined) {
                        var underlyingArray = this.peek();
                        var allValues = underlyingArray.slice(0);
                        this.valueWillMutate();
                        underlyingArray.splice(0, underlyingArray.length);
                        this.valueHasMutated();
                        return allValues;
                    }
                    // If you passed an arg, we interpret it as an array of entries to remove
                    if (!arrayOfValues)
                        return [];
                    return this['remove'](function (value) {
                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
                    });
                },

                'destroy': function (valueOrPredicate) {
                    var underlyingArray = this.peek();
                    var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
                    this.valueWillMutate();
                    for (var i = underlyingArray.length - 1; i >= 0; i--) {
                        var value = underlyingArray[i];
                        if (predicate(value))
                            underlyingArray[i]["_destroy"] = true;
                    }
                    this.valueHasMutated();
                },

                'destroyAll': function (arrayOfValues) {
                    // If you passed zero args, we destroy everything
                    if (arrayOfValues === undefined)
                        return this['destroy'](function () { return true });

                    // If you passed an arg, we interpret it as an array of entries to destroy
                    if (!arrayOfValues)
                        return [];
                    return this['destroy'](function (value) {
                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
                    });
                },

                'indexOf': function (item) {
                    var underlyingArray = this();
                    return ko.utils.arrayIndexOf(underlyingArray, item);
                },

                'replace': function (oldItem, newItem) {
                    var index = this['indexOf'](oldItem);
                    if (index >= 0) {
                        this.valueWillMutate();
                        this.peek()[index] = newItem;
                        this.valueHasMutated();
                    }
                }
            }

            // Populate ko.observableArray.fn with read/write functions from native arrays
            // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
            // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
            ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
                ko.observableArray['fn'][methodName] = function () {
                    // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
                    // (for consistency with mutating regular observables)
                    var underlyingArray = this.peek();
                    this.valueWillMutate();
                    var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
                    this.valueHasMutated();
                    return methodCallResult;
                };
            });

            // Populate ko.observableArray.fn with read-only functions from native arrays
            ko.utils.arrayForEach(["slice"], function (methodName) {
                ko.observableArray['fn'][methodName] = function () {
                    var underlyingArray = this();
                    return underlyingArray[methodName].apply(underlyingArray, arguments);
                };
            });

            ko.exportSymbol('observableArray', ko.observableArray);
            ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
                var _latestValue,
                    _hasBeenEvaluated = false,
                    _isBeingEvaluated = false,
                    readFunction = evaluatorFunctionOrOptions;

                if (readFunction && typeof readFunction == "object") {
                    // Single-parameter syntax - everything is on this "options" param
                    options = readFunction;
                    readFunction = options["read"];
                } else {
                    // Multi-parameter syntax - construct the options according to the params passed
                    options = options || {};
                    if (!readFunction)
                        readFunction = options["read"];
                }
                if (typeof readFunction != "function")
                    throw new Error("Pass a function that returns the value of the ko.computed");

                function addSubscriptionToDependency(subscribable) {
                    _subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
                }

                function disposeAllSubscriptionsToDependencies() {
                    ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
                        subscription.dispose();
                    });
                    _subscriptionsToDependencies = [];
                }

                function evaluatePossiblyAsync() {
                    var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
                    if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
                        clearTimeout(evaluationTimeoutInstance);
                        evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
                    } else
                        evaluateImmediate();
                }

                function evaluateImmediate() {
                    if (_isBeingEvaluated) {
                        // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
                        // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
                        // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
                        // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
                        return;
                    }

                    // Don't dispose on first evaluation, because the "disposeWhen" callback might
                    // e.g., dispose when the associated DOM element isn't in the doc, and it's not
                    // going to be in the doc until *after* the first evaluation
                    if (_hasBeenEvaluated && disposeWhen()) {
                        dispose();
                        return;
                    }

                    _isBeingEvaluated = true;
                    try {
                        // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
                        // Then, during evaluation, we cross off any that are in fact still being used.
                        var disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function (item) { return item.target; });

                        ko.dependencyDetection.begin(function (subscribable) {
                            var inOld;
                            if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
                                disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
                            else
                                addSubscriptionToDependency(subscribable); // Brand new subscription - add it
                        });

                        var newValue = readFunction.call(evaluatorFunctionTarget);

                        // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
                        for (var i = disposalCandidates.length - 1; i >= 0; i--) {
                            if (disposalCandidates[i])
                                _subscriptionsToDependencies.splice(i, 1)[0].dispose();
                        }
                        _hasBeenEvaluated = true;

                        dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
                        _latestValue = newValue;
                        if (DEBUG) dependentObservable._latestValue = _latestValue;
                    } finally {
                        ko.dependencyDetection.end();
                    }

                    dependentObservable["notifySubscribers"](_latestValue);
                    _isBeingEvaluated = false;
                    if (!_subscriptionsToDependencies.length)
                        dispose();
                }

                function dependentObservable() {
                    if (arguments.length > 0) {
                        if (typeof writeFunction === "function") {
                            // Writing a value
                            writeFunction.apply(evaluatorFunctionTarget, arguments);
                        } else {
                            throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
                        }
                        return this; // Permits chained assignments
                    } else {
                        // Reading the value
                        if (!_hasBeenEvaluated)
                            evaluateImmediate();
                        ko.dependencyDetection.registerDependency(dependentObservable);
                        return _latestValue;
                    }
                }

                function peek() {
                    if (!_hasBeenEvaluated)
                        evaluateImmediate();
                    return _latestValue;
                }

                function isActive() {
                    return !_hasBeenEvaluated || _subscriptionsToDependencies.length > 0;
                }

                // By here, "options" is always non-null
                var writeFunction = options["write"],
                    disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
                    disposeWhen = options["disposeWhen"] || options.disposeWhen || function () { return false; },
                    dispose = disposeAllSubscriptionsToDependencies,
                    _subscriptionsToDependencies = [],
                    evaluationTimeoutInstance = null;

                if (!evaluatorFunctionTarget)
                    evaluatorFunctionTarget = options["owner"];

                dependentObservable.peek = peek;
                dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; };
                dependentObservable.hasWriteFunction = typeof options["write"] === "function";
                dependentObservable.dispose = function () { dispose(); };
                dependentObservable.isActive = isActive;

                ko.subscribable.call(dependentObservable);
                ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);

                ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
                ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
                ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
                ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);

                // Evaluate, unless deferEvaluation is true
                if (options['deferEvaluation'] !== true)
                    evaluateImmediate();

                // Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values.
                // But skip if isActive is false (there will never be any dependencies to dispose).
                // (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
                // plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
                if (disposeWhenNodeIsRemoved && isActive()) {
                    dispose = function () {
                        ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, arguments.callee);
                        disposeAllSubscriptionsToDependencies();
                    };
                    ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
                    var existingDisposeWhenFunction = disposeWhen;
                    disposeWhen = function () {
                        return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
                    }
                }

                return dependentObservable;
            };

            ko.isComputed = function (instance) {
                return ko.hasPrototype(instance, ko.dependentObservable);
            };

            var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
            ko.dependentObservable[protoProp] = ko.observable;

            ko.dependentObservable['fn'] = {};
            ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;

            ko.exportSymbol('dependentObservable', ko.dependentObservable);
            ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
            ko.exportSymbol('isComputed', ko.isComputed);

            (function () {
                var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)

                ko.toJS = function (rootObject) {
                    if (arguments.length == 0)
                        throw new Error("When calling ko.toJS, pass the object you want to convert.");

                    // We just unwrap everything at every level in the object graph
                    return mapJsObjectGraph(rootObject, function (valueToMap) {
                        // Loop because an observable's value might in turn be another observable wrapper
                        for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth) ; i++)
                            valueToMap = valueToMap();
                        return valueToMap;
                    });
                };

                ko.toJSON = function (rootObject, replacer, space) {     // replacer and space are optional
                    var plainJavaScriptObject = ko.toJS(rootObject);
                    return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
                };

                function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
                    visitedObjects = visitedObjects || new objectLookup();

                    rootObject = mapInputCallback(rootObject);
                    var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date));
                    if (!canHaveProperties)
                        return rootObject;

                    var outputProperties = rootObject instanceof Array ? [] : {};
                    visitedObjects.save(rootObject, outputProperties);

                    visitPropertiesOrArrayEntries(rootObject, function (indexer) {
                        var propertyValue = mapInputCallback(rootObject[indexer]);

                        switch (typeof propertyValue) {
                            case "boolean":
                            case "number":
                            case "string":
                            case "function":
                                outputProperties[indexer] = propertyValue;
                                break;
                            case "object":
                            case "undefined":
                                var previouslyMappedValue = visitedObjects.get(propertyValue);
                                outputProperties[indexer] = (previouslyMappedValue !== undefined)
                                    ? previouslyMappedValue
                                    : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
                                break;
                        }
                    });

                    return outputProperties;
                }

                function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
                    if (rootObject instanceof Array) {
                        for (var i = 0; i < rootObject.length; i++)
                            visitorCallback(i);

                        // For arrays, also respect toJSON property for custom mappings (fixes #278)
                        if (typeof rootObject['toJSON'] == 'function')
                            visitorCallback('toJSON');
                    } else {
                        for (var propertyName in rootObject)
                            visitorCallback(propertyName);
                    }
                };

                function objectLookup() {
                    var keys = [];
                    var values = [];
                    this.save = function (key, value) {
                        var existingIndex = ko.utils.arrayIndexOf(keys, key);
                        if (existingIndex >= 0)
                            values[existingIndex] = value;
                        else {
                            keys.push(key);
                            values.push(value);
                        }
                    };
                    this.get = function (key) {
                        var existingIndex = ko.utils.arrayIndexOf(keys, key);
                        return (existingIndex >= 0) ? values[existingIndex] : undefined;
                    };
                };
            })();

            ko.exportSymbol('toJS', ko.toJS);
            ko.exportSymbol('toJSON', ko.toJSON);
            (function () {
                var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';

                // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
                // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
                // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
                ko.selectExtensions = {
                    readValue: function (element) {
                        switch (ko.utils.tagNameLower(element)) {
                            case 'option':
                                if (element[hasDomDataExpandoProperty] === true)
                                    return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
                                return ko.utils.ieVersion <= 7
                                    ? (element.getAttributeNode('value').specified ? element.value : element.text)
                                    : element.value;
                            case 'select':
                                return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
                            default:
                                return element.value;
                        }
                    },

                    writeValue: function (element, value) {
                        switch (ko.utils.tagNameLower(element)) {
                            case 'option':
                                switch (typeof value) {
                                    case "string":
                                        ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
                                        if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
                                            delete element[hasDomDataExpandoProperty];
                                        }
                                        element.value = value;
                                        break;
                                    default:
                                        // Store arbitrary object using DomData
                                        ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
                                        element[hasDomDataExpandoProperty] = true;

                                        // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
                                        element.value = typeof value === "number" ? value : "";
                                        break;
                                }
                                break;
                            case 'select':
                                for (var i = element.options.length - 1; i >= 0; i--) {
                                    if (ko.selectExtensions.readValue(element.options[i]) == value) {
                                        element.selectedIndex = i;
                                        break;
                                    }
                                }
                                break;
                            default:
                                if ((value === null) || (value === undefined))
                                    value = "";
                                element.value = value;
                                break;
                        }
                    }
                };
            })();

            ko.exportSymbol('selectExtensions', ko.selectExtensions);
            ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
            ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
            ko.expressionRewriting = (function () {
                var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
                var javaScriptReservedWords = ["true", "false"];

                // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
                // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
                var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;

                function restoreTokens(string, tokens) {
                    var prevValue = null;
                    while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
                        prevValue = string;
                        string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
                            return tokens[tokenIndex];
                        });
                    }
                    return string;
                }

                function getWriteableValue(expression) {
                    if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
                        return false;
                    var match = expression.match(javaScriptAssignmentTarget);
                    return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
                }

                function ensureQuoted(key) {
                    var trimmedKey = ko.utils.stringTrim(key);
                    switch (trimmedKey.length && trimmedKey.charAt(0)) {
                        case "'":
                        case '"':
                            return key;
                        default:
                            return "'" + trimmedKey + "'";
                    }
                }

                return {
                    bindingRewriteValidators: [],

                    parseObjectLiteral: function (objectLiteralString) {
                        // A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
                        // that is sufficient just to split an object literal string into a set of top-level key-value pairs

                        var str = ko.utils.stringTrim(objectLiteralString);
                        if (str.length < 3)
                            return [];
                        if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
                            str = str.substring(1, str.length - 1);

                        // Pull out any string literals and regex literals
                        var tokens = [];
                        var tokenStart = null, tokenEndChar;
                        for (var position = 0; position < str.length; position++) {
                            var c = str.charAt(position);
                            if (tokenStart === null) {
                                switch (c) {
                                    case '"':
                                    case "'":
                                    case "/":
                                        tokenStart = position;
                                        tokenEndChar = c;
                                        break;
                                }
                            } else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
                                var token = str.substring(tokenStart, position + 1);
                                tokens.push(token);
                                var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                                str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                                position -= (token.length - replacement.length);
                                tokenStart = null;
                            }
                        }

                        // Next pull out balanced paren, brace, and bracket blocks
                        tokenStart = null;
                        tokenEndChar = null;
                        var tokenDepth = 0, tokenStartChar = null;
                        for (var position = 0; position < str.length; position++) {
                            var c = str.charAt(position);
                            if (tokenStart === null) {
                                switch (c) {
                                    case "{": tokenStart = position; tokenStartChar = c;
                                        tokenEndChar = "}";
                                        break;
                                    case "(": tokenStart = position; tokenStartChar = c;
                                        tokenEndChar = ")";
                                        break;
                                    case "[": tokenStart = position; tokenStartChar = c;
                                        tokenEndChar = "]";
                                        break;
                                }
                            }

                            if (c === tokenStartChar)
                                tokenDepth++;
                            else if (c === tokenEndChar) {
                                tokenDepth--;
                                if (tokenDepth === 0) {
                                    var token = str.substring(tokenStart, position + 1);
                                    tokens.push(token);
                                    var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                                    str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                                    position -= (token.length - replacement.length);
                                    tokenStart = null;
                                }
                            }
                        }

                        // Now we can safely split on commas to get the key/value pairs
                        var result = [];
                        var keyValuePairs = str.split(",");
                        for (var i = 0, j = keyValuePairs.length; i < j; i++) {
                            var pair = keyValuePairs[i];
                            var colonPos = pair.indexOf(":");
                            if ((colonPos > 0) && (colonPos < pair.length - 1)) {
                                var key = pair.substring(0, colonPos);
                                var value = pair.substring(colonPos + 1);
                                result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
                            } else {
                                result.push({ 'unknown': restoreTokens(pair, tokens) });
                            }
                        }
                        return result;
                    },

                    preProcessBindings: function (objectLiteralStringOrKeyValueArray) {
                        var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
                            ? ko.expressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
                            : objectLiteralStringOrKeyValueArray;
                        var resultStrings = [], propertyAccessorResultStrings = [];

                        var keyValueEntry;
                        for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
                            if (resultStrings.length > 0)
                                resultStrings.push(",");

                            if (keyValueEntry['key']) {
                                var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
                                resultStrings.push(quotedKey);
                                resultStrings.push(":");
                                resultStrings.push(val);

                                if (val = getWriteableValue(ko.utils.stringTrim(val))) {
                                    if (propertyAccessorResultStrings.length > 0)
                                        propertyAccessorResultStrings.push(", ");
                                    propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
                                }
                            } else if (keyValueEntry['unknown']) {
                                resultStrings.push(keyValueEntry['unknown']);
                            }
                        }

                        var combinedResult = resultStrings.join("");
                        if (propertyAccessorResultStrings.length > 0) {
                            var allPropertyAccessors = propertyAccessorResultStrings.join("");
                            combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
                        }

                        return combinedResult;
                    },

                    keyValueArrayContainsKey: function (keyValueArray, key) {
                        for (var i = 0; i < keyValueArray.length; i++)
                            if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
                                return true;
                        return false;
                    },

                    // Internal, private KO utility for updating model properties from within bindings
                    // property:            If the property being updated is (or might be) an observable, pass it here
                    //                      If it turns out to be a writable observable, it will be written to directly
                    // allBindingsAccessor: All bindings in the current execution context.
                    //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
                    // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
                    // value:               The value to be written
                    // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if
                    //                      it is !== existing value on that writable observable
                    writeValueToProperty: function (property, allBindingsAccessor, key, value, checkIfDifferent) {
                        if (!property || !ko.isWriteableObservable(property)) {
                            var propWriters = allBindingsAccessor()['_ko_property_writers'];
                            if (propWriters && propWriters[key])
                                propWriters[key](value);
                        } else if (!checkIfDifferent || property.peek() !== value) {
                            property(value);
                        }
                    }
                };
            })();

            ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
            ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
            ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
            ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);

            // For backward compatibility, define the following aliases. (Previously, these function names were misleading because
            // they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
            ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
            ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings); (function () {
                // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
                // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
                // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
                // of that virtual hierarchy
                //
                // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
                // without having to scatter special cases all over the binding and templating code.

                // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
                // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
                // So, use node.text where available, and node.nodeValue elsewhere
                var commentNodesHaveTextProperty = document.createComment("test").text === "<!--test-->";

                var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*-->$/ : /^\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*$/;
                var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
                var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };

                function isStartComment(node) {
                    return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
                }

                function isEndComment(node) {
                    return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
                }

                function getVirtualChildren(startComment, allowUnbalanced) {
                    var currentNode = startComment;
                    var depth = 1;
                    var children = [];
                    while (currentNode = currentNode.nextSibling) {
                        if (isEndComment(currentNode)) {
                            depth--;
                            if (depth === 0)
                                return children;
                        }

                        children.push(currentNode);

                        if (isStartComment(currentNode))
                            depth++;
                    }
                    if (!allowUnbalanced)
                        throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
                    return null;
                }

                function getMatchingEndComment(startComment, allowUnbalanced) {
                    var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
                    if (allVirtualChildren) {
                        if (allVirtualChildren.length > 0)
                            return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
                        return startComment.nextSibling;
                    } else
                        return null; // Must have no matching end comment, and allowUnbalanced is true
                }

                function getUnbalancedChildTags(node) {
                    // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
                    //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->
                    var childNode = node.firstChild, captureRemaining = null;
                    if (childNode) {
                        do {
                            if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes
                                captureRemaining.push(childNode);
                            else if (isStartComment(childNode)) {
                                var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
                                if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set
                                    childNode = matchingEndComment;
                                else
                                    captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
                            } else if (isEndComment(childNode)) {
                                captureRemaining = [childNode];     // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
                            }
                        } while (childNode = childNode.nextSibling);
                    }
                    return captureRemaining;
                }

                ko.virtualElements = {
                    allowedBindings: {},

                    childNodes: function (node) {
                        return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
                    },

                    emptyNode: function (node) {
                        if (!isStartComment(node))
                            ko.utils.emptyDomNode(node);
                        else {
                            var virtualChildren = ko.virtualElements.childNodes(node);
                            for (var i = 0, j = virtualChildren.length; i < j; i++)
                                ko.removeNode(virtualChildren[i]);
                        }
                    },

                    setDomNodeChildren: function (node, childNodes) {
                        if (!isStartComment(node))
                            ko.utils.setDomNodeChildren(node, childNodes);
                        else {
                            ko.virtualElements.emptyNode(node);
                            var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
                            for (var i = 0, j = childNodes.length; i < j; i++)
                                endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
                        }
                    },

                    prepend: function (containerNode, nodeToPrepend) {
                        if (!isStartComment(containerNode)) {
                            if (containerNode.firstChild)
                                containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
                            else
                                containerNode.appendChild(nodeToPrepend);
                        } else {
                            // Start comments must always have a parent and at least one following sibling (the end comment)
                            containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
                        }
                    },

                    insertAfter: function (containerNode, nodeToInsert, insertAfterNode) {
                        if (!insertAfterNode) {
                            ko.virtualElements.prepend(containerNode, nodeToInsert);
                        } else if (!isStartComment(containerNode)) {
                            // Insert after insertion point
                            if (insertAfterNode.nextSibling)
                                containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
                            else
                                containerNode.appendChild(nodeToInsert);
                        } else {
                            // Children of start comments must always have a parent and at least one following sibling (the end comment)
                            containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
                        }
                    },

                    firstChild: function (node) {
                        if (!isStartComment(node))
                            return node.firstChild;
                        if (!node.nextSibling || isEndComment(node.nextSibling))
                            return null;
                        return node.nextSibling;
                    },

                    nextSibling: function (node) {
                        if (isStartComment(node))
                            node = getMatchingEndComment(node);
                        if (node.nextSibling && isEndComment(node.nextSibling))
                            return null;
                        return node.nextSibling;
                    },

                    virtualNodeBindingValue: function (node) {
                        var regexMatch = isStartComment(node);
                        return regexMatch ? regexMatch[1] : null;
                    },

                    normaliseVirtualElementDomStructure: function (elementVerified) {
                        // Workaround for https://github.com/SteveSanderson/knockout/issues/155
                        // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
                        // that are direct descendants of <ul> into the preceding <li>)
                        if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
                            return;

                        // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
                        // must be intended to appear *after* that child, so move them there.
                        var childNode = elementVerified.firstChild;
                        if (childNode) {
                            do {
                                if (childNode.nodeType === 1) {
                                    var unbalancedTags = getUnbalancedChildTags(childNode);
                                    if (unbalancedTags) {
                                        // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
                                        var nodeToInsertBefore = childNode.nextSibling;
                                        for (var i = 0; i < unbalancedTags.length; i++) {
                                            if (nodeToInsertBefore)
                                                elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
                                            else
                                                elementVerified.appendChild(unbalancedTags[i]);
                                        }
                                    }
                                }
                            } while (childNode = childNode.nextSibling);
                        }
                    }
                };
            })();
            ko.exportSymbol('virtualElements', ko.virtualElements);
            ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
            ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
            //ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minified
            ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
            //ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minified
            ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
            ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
            (function () {
                var defaultBindingAttributeName = "data-bind";

                ko.bindingProvider = function () {
                    this.bindingCache = {};
                };

                ko.utils.extend(ko.bindingProvider.prototype, {
                    'nodeHasBindings': function (node) {
                        switch (node.nodeType) {
                            case 1: return node.getAttribute(defaultBindingAttributeName) != null;   // Element
                            case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
                            default: return false;
                        }
                    },

                    'getBindings': function (node, bindingContext) {
                        var bindingsString = this['getBindingsString'](node, bindingContext);
                        return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
                    },

                    // The following function is only used internally by this default provider.
                    // It's not part of the interface definition for a general binding provider.
                    'getBindingsString': function (node, bindingContext) {
                        switch (node.nodeType) {
                            case 1: return node.getAttribute(defaultBindingAttributeName);   // Element
                            case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
                            default: return null;
                        }
                    },

                    // The following function is only used internally by this default provider.
                    // It's not part of the interface definition for a general binding provider.
                    'parseBindingsString': function (bindingsString, bindingContext, node) {
                        try {
                            var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache);
                            return bindingFunction(bindingContext, node);
                        } catch (ex) {
                            throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
                        }
                    }
                });

                ko.bindingProvider['instance'] = new ko.bindingProvider();

                function createBindingsStringEvaluatorViaCache(bindingsString, cache) {
                    var cacheKey = bindingsString;
                    return cache[cacheKey]
                        || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString));
                }

                function createBindingsStringEvaluator(bindingsString) {
                    // Build the source for a function that evaluates "expression"
                    // For each scope variable, add an extra level of "with" nesting
                    // Example result: with(sc1) { with(sc0) { return (expression) } }
                    var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString),
                        functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
                    return new Function("$context", "$element", functionBody);
                }
            })();

            ko.exportSymbol('bindingProvider', ko.bindingProvider);
            (function () {
                ko.bindingHandlers = {};

                ko.bindingContext = function (dataItem, parentBindingContext, dataItemAlias) {
                    if (parentBindingContext) {
                        ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
                        this['$parentContext'] = parentBindingContext;
                        this['$parent'] = parentBindingContext['$data'];
                        this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
                        this['$parents'].unshift(this['$parent']);
                    } else {
                        this['$parents'] = [];
                        this['$root'] = dataItem;
                        // Export 'ko' in the binding context so it will be available in bindings and templates
                        // even if 'ko' isn't exported as a global, such as when using an AMD loader.
                        // See https://github.com/SteveSanderson/knockout/issues/490
                        this['ko'] = ko;
                    }
                    this['$data'] = dataItem;
                    if (dataItemAlias)
                        this[dataItemAlias] = dataItem;
                }
                ko.bindingContext.prototype['createChildContext'] = function (dataItem, dataItemAlias) {
                    return new ko.bindingContext(dataItem, this, dataItemAlias);
                };
                ko.bindingContext.prototype['extend'] = function (properties) {
                    var clone = ko.utils.extend(new ko.bindingContext(), this);
                    return ko.utils.extend(clone, properties);
                };

                function validateThatBindingIsAllowedForVirtualElements(bindingName) {
                    var validator = ko.virtualElements.allowedBindings[bindingName];
                    if (!validator)
                        throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
                }

                function applyBindingsToDescendantsInternal(viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
                    var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
                    while (currentChild = nextInQueue) {
                        // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
                        nextInQueue = ko.virtualElements.nextSibling(currentChild);
                        applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
                    }
                }

                function applyBindingsToNodeAndDescendantsInternal(viewModel, nodeVerified, bindingContextMayDifferFromDomParentElement) {
                    var shouldBindDescendants = true;

                    // Perf optimisation: Apply bindings only if...
                    // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
                    //     Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
                    // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
                    var isElement = (nodeVerified.nodeType === 1);
                    if (isElement) // Workaround IE <= 8 HTML parsing weirdness
                        ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);

                    var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement)             // Case (1)
                                           || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);       // Case (2)
                    if (shouldApplyBindings)
                        shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;

                    if (shouldBindDescendants) {
                        // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
                        //  * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
                        //    hence bindingContextsMayDifferFromDomParentElement is false
                        //  * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
                        //    skip over any number of intermediate virtual elements, any of which might define a custom binding context,
                        //    hence bindingContextsMayDifferFromDomParentElement is true
                        applyBindingsToDescendantsInternal(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
                    }
                }

                function applyBindingsToNodeInternal(node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
                    // Need to be sure that inits are only run once, and updates never run until all the inits have been run
                    var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits

                    // Each time the dependentObservable is evaluated (after data changes),
                    // the binding attribute is reparsed so that it can pick out the correct
                    // model properties in the context of the changed data.
                    // DOM event callbacks need to be able to access this changed data,
                    // so we need a single parsedBindings variable (shared by all callbacks
                    // associated with this node's bindings) that all the closures can access.
                    var parsedBindings;
                    function makeValueAccessor(bindingKey) {
                        return function () { return parsedBindings[bindingKey] }
                    }
                    function parsedBindingsAccessor() {
                        return parsedBindings;
                    }

                    var bindingHandlerThatControlsDescendantBindings;
                    ko.dependentObservable(
                        function () {
                            // Ensure we have a nonnull binding context to work with
                            var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
                                ? viewModelOrBindingContext
                                : new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
                            var viewModel = bindingContextInstance['$data'];

                            // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
                            // we can easily recover it just by scanning up the node's ancestors in the DOM
                            // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
                            if (bindingContextMayDifferFromDomParentElement)
                                ko.storedBindingContextForNode(node, bindingContextInstance);

                            // Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
                            var evaluatedBindings = (typeof bindings == "function") ? bindings(bindingContextInstance, node) : bindings;
                            parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);

                            if (parsedBindings) {
                                // First run all the inits, so bindings can register for notification on changes
                                if (initPhase === 0) {
                                    initPhase = 1;
                                    for (var bindingKey in parsedBindings) {
                                        var binding = ko.bindingHandlers[bindingKey];
                                        if (binding && node.nodeType === 8)
                                            validateThatBindingIsAllowedForVirtualElements(bindingKey);

                                        if (binding && typeof binding["init"] == "function") {
                                            var handlerInitFn = binding["init"];
                                            var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);

                                            // If this binding handler claims to control descendant bindings, make a note of this
                                            if (initResult && initResult['controlsDescendantBindings']) {
                                                if (bindingHandlerThatControlsDescendantBindings !== undefined)
                                                    throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
                                                bindingHandlerThatControlsDescendantBindings = bindingKey;
                                            }
                                        }
                                    }
                                    initPhase = 2;
                                }

                                // ... then run all the updates, which might trigger changes even on the first evaluation
                                if (initPhase === 2) {
                                    for (var bindingKey in parsedBindings) {
                                        var binding = ko.bindingHandlers[bindingKey];
                                        if (binding && typeof binding["update"] == "function") {
                                            var handlerUpdateFn = binding["update"];
                                            handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
                                        }
                                    }
                                }
                            }
                        },
                        null,
                        { disposeWhenNodeIsRemoved: node }
                    );

                    return {
                        shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
                    };
                };

                var storedBindingContextDomDataKey = "__ko_bindingContext__";
                ko.storedBindingContextForNode = function (node, bindingContext) {
                    if (arguments.length == 2)
                        ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
                    else
                        return ko.utils.domData.get(node, storedBindingContextDomDataKey);
                }

                ko.applyBindingsToNode = function (node, bindings, viewModel) {
                    if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
                        ko.virtualElements.normaliseVirtualElementDomStructure(node);
                    return applyBindingsToNodeInternal(node, bindings, viewModel, true);
                };

                ko.applyBindingsToDescendants = function (viewModel, rootNode) {
                    if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
                        applyBindingsToDescendantsInternal(viewModel, rootNode, true);
                };

                ko.applyBindings = function (viewModel, rootNode) {
                    if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
                        throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
                    rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional

                    applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
                };

                // Retrieving binding context from arbitrary nodes
                ko.contextFor = function (node) {
                    // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
                    switch (node.nodeType) {
                        case 1:
                        case 8:
                            var context = ko.storedBindingContextForNode(node);
                            if (context) return context;
                            if (node.parentNode) return ko.contextFor(node.parentNode);
                            break;
                    }
                    return undefined;
                };
                ko.dataFor = function (node) {
                    var context = ko.contextFor(node);
                    return context ? context['$data'] : undefined;
                };

                ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
                ko.exportSymbol('applyBindings', ko.applyBindings);
                ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
                ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
                ko.exportSymbol('contextFor', ko.contextFor);
                ko.exportSymbol('dataFor', ko.dataFor);
            })();
            var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
            ko.bindingHandlers['attr'] = {
                'update': function (element, valueAccessor, allBindingsAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor()) || {};
                    for (var attrName in value) {
                        if (typeof attrName == "string") {
                            var attrValue = ko.utils.unwrapObservable(value[attrName]);

                            // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
                            // when someProp is a "no value"-like value (strictly null, false, or undefined)
                            // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
                            var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
                            if (toRemove)
                                element.removeAttribute(attrName);

                            // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
                            // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
                            // but instead of figuring out the mode, we'll just set the attribute through the Javascript
                            // property for IE <= 8.
                            if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
                                attrName = attrHtmlToJavascriptMap[attrName];
                                if (toRemove)
                                    element.removeAttribute(attrName);
                                else
                                    element[attrName] = attrValue;
                            } else if (!toRemove) {
                                element.setAttribute(attrName, attrValue.toString());
                            }

                            // Treat "name" specially - although you can think of it as an attribute, it also needs
                            // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
                            // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
                            // entirely, and there's no strong reason to allow for such casing in HTML.
                            if (attrName === "name") {
                                ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
                            }
                        }
                    }
                }
            };
            ko.bindingHandlers['checked'] = {
                'init': function (element, valueAccessor, allBindingsAccessor) {
                    var updateHandler = function () {
                        var valueToWrite;
                        if (element.type == "checkbox") {
                            valueToWrite = element.checked;
                        } else if ((element.type == "radio") && (element.checked)) {
                            valueToWrite = element.value;
                        } else {
                            return; // "checked" binding only responds to checkboxes and selected radio buttons
                        }

                        var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue);
                        if ((element.type == "checkbox") && (unwrappedValue instanceof Array)) {
                            // For checkboxes bound to an array, we add/remove the checkbox value to that array
                            // This works for both observable and non-observable arrays
                            var existingEntryIndex = ko.utils.arrayIndexOf(unwrappedValue, element.value);
                            if (element.checked && (existingEntryIndex < 0))
                                modelValue.push(element.value);
                            else if ((!element.checked) && (existingEntryIndex >= 0))
                                modelValue.splice(existingEntryIndex, 1);
                        } else {
                            ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
                        }
                    };
                    ko.utils.registerEventHandler(element, "click", updateHandler);

                    // IE 6 won't allow radio buttons to be selected unless they have a name
                    if ((element.type == "radio") && !element.name)
                        ko.bindingHandlers['uniqueName']['init'](element, function () { return true });
                },
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor());

                    if (element.type == "checkbox") {
                        if (value instanceof Array) {
                            // When bound to an array, the checkbox being checked represents its value being present in that array
                            element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
                        } else {
                            // When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
                            element.checked = value;
                        }
                    } else if (element.type == "radio") {
                        element.checked = (element.value == value);
                    }
                }
            };
            var classesWrittenByBindingKey = '__ko__cssValue';
            ko.bindingHandlers['css'] = {
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor());
                    if (typeof value == "object") {
                        for (var className in value) {
                            var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
                            ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
                        }
                    } else {
                        value = String(value || ''); // Make sure we don't try to store or set a non-string value
                        ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
                        element[classesWrittenByBindingKey] = value;
                        ko.utils.toggleDomNodeCssClass(element, value, true);
                    }
                }
            };
            ko.bindingHandlers['enable'] = {
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor());
                    if (value && element.disabled)
                        element.removeAttribute("disabled");
                    else if ((!value) && (!element.disabled))
                        element.disabled = true;
                }
            };

            ko.bindingHandlers['disable'] = {
                'update': function (element, valueAccessor) {
                    ko.bindingHandlers['enable']['update'](element, function () { return !ko.utils.unwrapObservable(valueAccessor()) });
                }
            };
            // For certain common events (currently just 'click'), allow a simplified data-binding syntax
            // e.g. click:handler instead of the usual full-length event:{click:handler}
            function makeEventHandlerShortcut(eventName) {
                ko.bindingHandlers[eventName] = {
                    'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
                        var newValueAccessor = function () {
                            var result = {};
                            result[eventName] = valueAccessor();
                            return result;
                        };
                        return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
                    }
                }
            }

            ko.bindingHandlers['event'] = {
                'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
                    var eventsToHandle = valueAccessor() || {};
                    for (var eventNameOutsideClosure in eventsToHandle) {
                        (function () {
                            var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
                            if (typeof eventName == "string") {
                                ko.utils.registerEventHandler(element, eventName, function (event) {
                                    var handlerReturnValue;
                                    var handlerFunction = valueAccessor()[eventName];
                                    if (!handlerFunction)
                                        return;
                                    var allBindings = allBindingsAccessor();

                                    try {
                                        // Take all the event args, and prefix with the viewmodel
                                        var argsForHandler = ko.utils.makeArray(arguments);
                                        argsForHandler.unshift(viewModel);
                                        handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
                                    } finally {
                                        if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                                            if (event.preventDefault)
                                                event.preventDefault();
                                            else
                                                event.returnValue = false;
                                        }
                                    }

                                    var bubble = allBindings[eventName + 'Bubble'] !== false;
                                    if (!bubble) {
                                        event.cancelBubble = true;
                                        if (event.stopPropagation)
                                            event.stopPropagation();
                                    }
                                });
                            }
                        })();
                    }
                }
            };
            // "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
            // "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
            ko.bindingHandlers['foreach'] = {
                makeTemplateValueAccessor: function (valueAccessor) {
                    return function () {
                        var modelValue = valueAccessor(),
                            unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here

                        // If unwrappedValue is the array, pass in the wrapped value on its own
                        // The value will be unwrapped and tracked within the template binding
                        // (See https://github.com/SteveSanderson/knockout/issues/523)
                        if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
                            return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };

                        // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
                        ko.utils.unwrapObservable(modelValue);
                        return {
                            'foreach': unwrappedValue['data'],
                            'as': unwrappedValue['as'],
                            'includeDestroyed': unwrappedValue['includeDestroyed'],
                            'afterAdd': unwrappedValue['afterAdd'],
                            'beforeRemove': unwrappedValue['beforeRemove'],
                            'afterRender': unwrappedValue['afterRender'],
                            'beforeMove': unwrappedValue['beforeMove'],
                            'afterMove': unwrappedValue['afterMove'],
                            'templateEngine': ko.nativeTemplateEngine.instance
                        };
                    };
                },
                'init': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                    return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
                },
                'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                    return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
                }
            };
            ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
            ko.virtualElements.allowedBindings['foreach'] = true;
            var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
            ko.bindingHandlers['hasfocus'] = {
                'init': function (element, valueAccessor, allBindingsAccessor) {
                    var handleElementFocusChange = function (isFocused) {
                        // Where possible, ignore which event was raised and determine focus state using activeElement,
                        // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
                        // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
                        // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
                        // from calling 'blur()' on the element when it loses focus.
                        // Discussion at https://github.com/SteveSanderson/knockout/pull/352
                        element[hasfocusUpdatingProperty] = true;
                        var ownerDoc = element.ownerDocument;
                        if ("activeElement" in ownerDoc) {
                            isFocused = (ownerDoc.activeElement === element);
                        }
                        var modelValue = valueAccessor();
                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'hasfocus', isFocused, true);
                        element[hasfocusUpdatingProperty] = false;
                    };
                    var handleElementFocusIn = handleElementFocusChange.bind(null, true);
                    var handleElementFocusOut = handleElementFocusChange.bind(null, false);

                    ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
                    ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
                    ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
                    ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
                },
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor());
                    if (!element[hasfocusUpdatingProperty]) {
                        value ? element.focus() : element.blur();
                        ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
                    }
                }
            };
            ko.bindingHandlers['html'] = {
                'init': function () {
                    // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
                    return { 'controlsDescendantBindings': true };
                },
                'update': function (element, valueAccessor) {
                    // setHtml will unwrap the value if needed
                    ko.utils.setHtml(element, valueAccessor());
                }
            };
            var withIfDomDataKey = '__ko_withIfBindingData';
            // Makes a binding like with or if
            function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
                ko.bindingHandlers[bindingKey] = {
                    'init': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                        ko.utils.domData.set(element, withIfDomDataKey, {});
                        return { 'controlsDescendantBindings': true };
                    },
                    'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                        var withIfData = ko.utils.domData.get(element, withIfDomDataKey),
                            dataValue = ko.utils.unwrapObservable(valueAccessor()),
                            shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
                            isFirstRender = !withIfData.savedNodes,
                            needsRefresh = isFirstRender || isWith || (shouldDisplay !== withIfData.didDisplayOnLastUpdate);

                        if (needsRefresh) {
                            if (isFirstRender) {
                                withIfData.savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
                            }

                            if (shouldDisplay) {
                                if (!isFirstRender) {
                                    ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(withIfData.savedNodes));
                                }
                                ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
                            } else {
                                ko.virtualElements.emptyNode(element);
                            }

                            withIfData.didDisplayOnLastUpdate = shouldDisplay;
                        }
                    }
                };
                ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
                ko.virtualElements.allowedBindings[bindingKey] = true;
            }

            // Construct the actual binding handlers
            makeWithIfBinding('if');
            makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
            makeWithIfBinding('with', true /* isWith */, false /* isNot */,
                function (bindingContext, dataValue) {
                    return bindingContext['createChildContext'](dataValue);
                }
            );
            function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
                if (preferModelValue) {
                    if (modelValue !== ko.selectExtensions.readValue(element))
                        ko.selectExtensions.writeValue(element, modelValue);
                }

                // No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
                // If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
                // change the model value to match the dropdown.
                if (modelValue !== ko.selectExtensions.readValue(element))
                    ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
            };

            ko.bindingHandlers['options'] = {
                'update': function (element, valueAccessor, allBindingsAccessor) {
                    if (ko.utils.tagNameLower(element) !== "select")
                        throw new Error("options binding applies only to SELECT elements");

                    var selectWasPreviouslyEmpty = element.length == 0;
                    var previousSelectedValues = ko.utils.arrayMap(ko.utils.arrayFilter(element.childNodes, function (node) {
                        return node.tagName && (ko.utils.tagNameLower(node) === "option") && node.selected;
                    }), function (node) {
                        return ko.selectExtensions.readValue(node) || node.innerText || node.textContent;
                    });
                    var previousScrollTop = element.scrollTop;

                    var value = ko.utils.unwrapObservable(valueAccessor());
                    var selectedValue = element.value;

                    // Remove all existing <option>s.
                    // Need to use .remove() rather than .removeChild() for <option>s otherwise IE behaves oddly (https://github.com/SteveSanderson/knockout/issues/134)
                    while (element.length > 0) {
                        ko.cleanNode(element.options[0]);
                        element.remove(0);
                    }

                    if (value) {
                        var allBindings = allBindingsAccessor(),
                            includeDestroyed = allBindings['optionsIncludeDestroyed'];

                        if (typeof value.length != "number")
                            value = [value];
                        if (allBindings['optionsCaption']) {
                            var option = document.createElement("option");
                            ko.utils.setHtml(option, allBindings['optionsCaption']);
                            ko.selectExtensions.writeValue(option, undefined);
                            element.appendChild(option);
                        }

                        for (var i = 0, j = value.length; i < j; i++) {
                            // Skip destroyed items
                            var arrayEntry = value[i];
                            if (arrayEntry && arrayEntry['_destroy'] && !includeDestroyed)
                                continue;

                            var option = document.createElement("option");

                            function applyToObject(object, predicate, defaultValue) {
                                var predicateType = typeof predicate;
                                if (predicateType == "function")    // Given a function; run it against the data value
                                    return predicate(object);
                                else if (predicateType == "string") // Given a string; treat it as a property name on the data value
                                    return object[predicate];
                                else                                // Given no optionsText arg; use the data value itself
                                    return defaultValue;
                            }

                            // Apply a value to the option element
                            var optionValue = applyToObject(arrayEntry, allBindings['optionsValue'], arrayEntry);
                            ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));

                            // Apply some text to the option element
                            var optionText = applyToObject(arrayEntry, allBindings['optionsText'], optionValue);
                            ko.utils.setTextContent(option, optionText);

                            element.appendChild(option);
                        }

                        // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
                        // That's why we first added them without selection. Now it's time to set the selection.
                        var newOptions = element.getElementsByTagName("option");
                        var countSelectionsRetained = 0;
                        for (var i = 0, j = newOptions.length; i < j; i++) {
                            if (ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[i])) >= 0) {
                                ko.utils.setOptionNodeSelectionState(newOptions[i], true);
                                countSelectionsRetained++;
                            }
                        }

                        element.scrollTop = previousScrollTop;

                        if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
                            // Ensure consistency between model value and selected option.
                            // If the dropdown is being populated for the first time here (or was otherwise previously empty),
                            // the dropdown selection state is meaningless, so we preserve the model value.
                            ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.peekObservable(allBindings['value']), /* preferModelValue */ true);
                        }

                        // Workaround for IE9 bug
                        ko.utils.ensureSelectElementIsRenderedCorrectly(element);
                    }
                }
            };
            ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';
            ko.bindingHandlers['selectedOptions'] = {
                'init': function (element, valueAccessor, allBindingsAccessor) {
                    ko.utils.registerEventHandler(element, "change", function () {
                        var value = valueAccessor(), valueToWrite = [];
                        ko.utils.arrayForEach(element.getElementsByTagName("option"), function (node) {
                            if (node.selected)
                                valueToWrite.push(ko.selectExtensions.readValue(node));
                        });
                        ko.expressionRewriting.writeValueToProperty(value, allBindingsAccessor, 'value', valueToWrite);
                    });
                },
                'update': function (element, valueAccessor) {
                    if (ko.utils.tagNameLower(element) != "select")
                        throw new Error("values binding applies only to SELECT elements");

                    var newValue = ko.utils.unwrapObservable(valueAccessor());
                    if (newValue && typeof newValue.length == "number") {
                        ko.utils.arrayForEach(element.getElementsByTagName("option"), function (node) {
                            var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
                            ko.utils.setOptionNodeSelectionState(node, isSelected);
                        });
                    }
                }
            };
            ko.bindingHandlers['style'] = {
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor() || {});
                    for (var styleName in value) {
                        if (typeof styleName == "string") {
                            var styleValue = ko.utils.unwrapObservable(value[styleName]);
                            element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
                        }
                    }
                }
            };
            ko.bindingHandlers['submit'] = {
                'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
                    if (typeof valueAccessor() != "function")
                        throw new Error("The value for a submit binding must be a function");
                    ko.utils.registerEventHandler(element, "submit", function (event) {
                        var handlerReturnValue;
                        var value = valueAccessor();
                        try { handlerReturnValue = value.call(viewModel, element); }
                        finally {
                            if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                                if (event.preventDefault)
                                    event.preventDefault();
                                else
                                    event.returnValue = false;
                            }
                        }
                    });
                }
            };
            ko.bindingHandlers['text'] = {
                'update': function (element, valueAccessor) {
                    ko.utils.setTextContent(element, valueAccessor());
                }
            };
            ko.virtualElements.allowedBindings['text'] = true;
            ko.bindingHandlers['uniqueName'] = {
                'init': function (element, valueAccessor) {
                    if (valueAccessor()) {
                        var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
                        ko.utils.setElementName(element, name);
                    }
                }
            };
            ko.bindingHandlers['uniqueName'].currentIndex = 0;
            ko.bindingHandlers['value'] = {
                'init': function (element, valueAccessor, allBindingsAccessor) {
                    // Always catch "change" event; possibly other events too if asked
                    var eventsToCatch = ["change"];
                    var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
                    var propertyChangedFired = false;
                    if (requestedEventsToCatch) {
                        if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
                            requestedEventsToCatch = [requestedEventsToCatch];
                        ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
                        eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
                    }

                    var valueUpdateHandler = function () {
                        propertyChangedFired = false;
                        var modelValue = valueAccessor();
                        var elementValue = ko.selectExtensions.readValue(element);
                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'value', elementValue);
                    }

                    // Workaround for https://github.com/SteveSanderson/knockout/issues/122
                    // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
                    var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
                                                   && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
                    if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
                        ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
                        ko.utils.registerEventHandler(element, "blur", function () {
                            if (propertyChangedFired) {
                                valueUpdateHandler();
                            }
                        });
                    }

                    ko.utils.arrayForEach(eventsToCatch, function (eventName) {
                        // The syntax "after<eventname>" means "run the handler asynchronously after the event"
                        // This is useful, for example, to catch "keydown" events after the browser has updated the control
                        // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
                        var handler = valueUpdateHandler;
                        if (ko.utils.stringStartsWith(eventName, "after")) {
                            handler = function () { setTimeout(valueUpdateHandler, 0) };
                            eventName = eventName.substring("after".length);
                        }
                        ko.utils.registerEventHandler(element, eventName, handler);
                    });
                },
                'update': function (element, valueAccessor) {
                    var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
                    var newValue = ko.utils.unwrapObservable(valueAccessor());
                    var elementValue = ko.selectExtensions.readValue(element);
                    var valueHasChanged = (newValue != elementValue);

                    // JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
                    // We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
                    if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
                        valueHasChanged = true;

                    if (valueHasChanged) {
                        var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
                        applyValueAction();

                        // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
                        // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
                        // to apply the value as well.
                        var alsoApplyAsynchronously = valueIsSelectOption;
                        if (alsoApplyAsynchronously)
                            setTimeout(applyValueAction, 0);
                    }

                    // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
                    // because you're not allowed to have a model value that disagrees with a visible UI selection.
                    if (valueIsSelectOption && (element.length > 0))
                        ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
                }
            };
            ko.bindingHandlers['visible'] = {
                'update': function (element, valueAccessor) {
                    var value = ko.utils.unwrapObservable(valueAccessor());
                    var isCurrentlyVisible = !(element.style.display == "none");
                    if (value && !isCurrentlyVisible)
                        element.style.display = "";
                    else if ((!value) && isCurrentlyVisible)
                        element.style.display = "none";
                }
            };
            // 'click' is just a shorthand for the usual full-length event:{click:handler}
            makeEventHandlerShortcut('click');
            // If you want to make a custom template engine,
            //
            // [1] Inherit from this class (like ko.nativeTemplateEngine does)
            // [2] Override 'renderTemplateSource', supplying a function with this signature:
            //
            //        function (templateSource, bindingContext, options) {
            //            // - templateSource.text() is the text of the template you should render
            //            // - bindingContext.$data is the data you should pass into the template
            //            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,
            //            //     and bindingContext.$root available in the template too
            //            // - options gives you access to any other properties set on "data-bind: { template: options }"
            //            //
            //            // Return value: an array of DOM nodes
            //        }
            //
            // [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
            //
            //        function (script) {
            //            // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
            //            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
            //        }
            //
            //     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
            //     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
            //     and then you don't need to override 'createJavaScriptEvaluatorBlock'.

            ko.templateEngine = function () { };

            ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
                throw new Error("Override renderTemplateSource");
            };

            ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
                throw new Error("Override createJavaScriptEvaluatorBlock");
            };

            ko.templateEngine.prototype['makeTemplateSource'] = function (template, templateDocument) {
                // Named template
                if (typeof template == "string") {
                    templateDocument = templateDocument || document;
                    var elem = templateDocument.getElementById(template);
                    if (!elem)
                        throw new Error("Cannot find template with ID " + template);
                    return new ko.templateSources.domElement(elem);
                } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
                    // Anonymous template
                    return new ko.templateSources.anonymousTemplate(template);
                } else
                    throw new Error("Unknown template type: " + template);
            };

            ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
                var templateSource = this['makeTemplateSource'](template, templateDocument);
                return this['renderTemplateSource'](templateSource, bindingContext, options);
            };

            ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
                // Skip rewriting if requested
                if (this['allowTemplateRewriting'] === false)
                    return true;
                return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
            };

            ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
                var templateSource = this['makeTemplateSource'](template, templateDocument);
                var rewritten = rewriterCallback(templateSource['text']());
                templateSource['text'](rewritten);
                templateSource['data']("isRewritten", true);
            };

            ko.exportSymbol('templateEngine', ko.templateEngine);

            ko.templateRewriting = (function () {
                var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
                var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;

                function validateDataBindValuesForRewriting(keyValueArray) {
                    var allValidators = ko.expressionRewriting.bindingRewriteValidators;
                    for (var i = 0; i < keyValueArray.length; i++) {
                        var key = keyValueArray[i]['key'];
                        if (allValidators.hasOwnProperty(key)) {
                            var validator = allValidators[key];

                            if (typeof validator === "function") {
                                var possibleErrorMessage = validator(keyValueArray[i]['value']);
                                if (possibleErrorMessage)
                                    throw new Error(possibleErrorMessage);
                            } else if (!validator) {
                                throw new Error("This template engine does not support the '" + key + "' binding within its templates");
                            }
                        }
                    }
                }

                function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
                    var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
                    validateDataBindValuesForRewriting(dataBindKeyValueArray);
                    var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray);

                    // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
                    // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
                    // extra indirection.
                    var applyBindingsToNextSiblingScript =
                        "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()})";
                    return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
                }

                return {
                    ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
                        if (!templateEngine['isTemplateRewritten'](template, templateDocument))
                            templateEngine['rewriteTemplate'](template, function (htmlString) {
                                return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
                            }, templateDocument);
                    },

                    memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
                        return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
                        }).replace(memoizeVirtualContainerBindingSyntaxRegex, function () {
                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
                        });
                    },

                    applyMemoizedBindingsToNextSibling: function (bindings) {
                        return ko.memoization.memoize(function (domNode, bindingContext) {
                            if (domNode.nextSibling)
                                ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
                        });
                    }
                }
            })();


            // Exported only because it has to be referenced by string lookup from within rewritten template
            ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
            (function () {
                // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
                // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
                //
                // Two are provided by default:
                //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element
                //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
                //                                           without reading/writing the actual element text content, since it will be overwritten
                //                                           with the rendered template output.
                // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
                // Template sources need to have the following functions:
                //   text() 			- returns the template text from your storage location
                //   text(value)		- writes the supplied template text to your storage location
                //   data(key)			- reads values stored using data(key, value) - see below
                //   data(key, value)	- associates "value" with this template and the key "key". Is used to store information like "isRewritten".
                //
                // Optionally, template sources can also have the following functions:
                //   nodes()            - returns a DOM element containing the nodes of this template, where available
                //   nodes(value)       - writes the given DOM element to your storage location
                // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
                // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
                //
                // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
                // using and overriding "makeTemplateSource" to return an instance of your custom template source.

                ko.templateSources = {};

                // ---- ko.templateSources.domElement -----

                ko.templateSources.domElement = function (element) {
                    this.domElement = element;
                }

                ko.templateSources.domElement.prototype['text'] = function (/* valueToWrite */) {
                    var tagNameLower = ko.utils.tagNameLower(this.domElement),
                        elemContentsProperty = tagNameLower === "script" ? "text"
                                             : tagNameLower === "textarea" ? "value"
                                             : "innerHTML";

                    if (arguments.length == 0) {
                        return this.domElement[elemContentsProperty];
                    } else {
                        var valueToWrite = arguments[0];
                        if (elemContentsProperty === "innerHTML")
                            ko.utils.setHtml(this.domElement, valueToWrite);
                        else
                            this.domElement[elemContentsProperty] = valueToWrite;
                    }
                };

                ko.templateSources.domElement.prototype['data'] = function (key /*, valueToWrite */) {
                    if (arguments.length === 1) {
                        return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
                    } else {
                        ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
                    }
                };

                // ---- ko.templateSources.anonymousTemplate -----
                // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
                // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
                // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.

                var anonymousTemplatesDomDataKey = "__ko_anon_template__";
                ko.templateSources.anonymousTemplate = function (element) {
                    this.domElement = element;
                }
                ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
                ko.templateSources.anonymousTemplate.prototype['text'] = function (/* valueToWrite */) {
                    if (arguments.length == 0) {
                        var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                        if (templateData.textData === undefined && templateData.containerData)
                            templateData.textData = templateData.containerData.innerHTML;
                        return templateData.textData;
                    } else {
                        var valueToWrite = arguments[0];
                        ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { textData: valueToWrite });
                    }
                };
                ko.templateSources.domElement.prototype['nodes'] = function (/* valueToWrite */) {
                    if (arguments.length == 0) {
                        var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                        return templateData.containerData;
                    } else {
                        var valueToWrite = arguments[0];
                        ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { containerData: valueToWrite });
                    }
                };

                ko.exportSymbol('templateSources', ko.templateSources);
                ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
                ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
            })();
            (function () {
                var _templateEngine;
                ko.setTemplateEngine = function (templateEngine) {
                    if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
                        throw new Error("templateEngine must inherit from ko.templateEngine");
                    _templateEngine = templateEngine;
                }

                function invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
                    var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
                    while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
                        nextInQueue = ko.virtualElements.nextSibling(node);
                        if (node.nodeType === 1 || node.nodeType === 8)
                            action(node);
                    }
                }

                function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
                    // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
                    // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
                    // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
                    // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
                    // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)

                    if (continuousNodeArray.length) {
                        var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1];

                        // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
                        // whereas a regular applyBindings won't introduce new memoized nodes
                        invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function (node) {
                            ko.applyBindings(bindingContext, node);
                        });
                        invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function (node) {
                            ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
                        });
                    }
                }

                function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
                    return nodeOrNodeArray.nodeType ? nodeOrNodeArray
                                                    : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
                                                    : null;
                }

                function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
                    options = options || {};
                    var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
                    var templateDocument = firstTargetNode && firstTargetNode.ownerDocument;
                    var templateEngineToUse = (options['templateEngine'] || _templateEngine);
                    ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
                    var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);

                    // Loosely check result is an array of DOM nodes
                    if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
                        throw new Error("Template engine must return an array of DOM nodes");

                    var haveAddedNodesToParent = false;
                    switch (renderMode) {
                        case "replaceChildren":
                            ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
                            haveAddedNodesToParent = true;
                            break;
                        case "replaceNode":
                            ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
                            haveAddedNodesToParent = true;
                            break;
                        case "ignoreTargetNode": break;
                        default:
                            throw new Error("Unknown renderMode: " + renderMode);
                    }

                    if (haveAddedNodesToParent) {
                        activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
                        if (options['afterRender'])
                            ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
                    }

                    return renderedNodesArray;
                }

                ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
                    options = options || {};
                    if ((options['templateEngine'] || _templateEngine) == undefined)
                        throw new Error("Set a template engine before calling renderTemplate");
                    renderMode = renderMode || "replaceChildren";

                    if (targetNodeOrNodeArray) {
                        var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);

                        var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
                        var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;

                        return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
                            function () {
                                // Ensure we've got a proper binding context to work with
                                var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
                                    ? dataOrBindingContext
                                    : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));

                                // Support selecting template as a function of the data being rendered
                                var templateName = typeof (template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;

                                var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
                                if (renderMode == "replaceNode") {
                                    targetNodeOrNodeArray = renderedNodesArray;
                                    firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
                                }
                            },
                            null,
                            { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
                        );
                    } else {
                        // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
                        return ko.memoization.memoize(function (domNode) {
                            ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
                        });
                    }
                };

                ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
                    // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
                    // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
                    var arrayItemContext;

                    // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
                    var executeTemplateForArrayItem = function (arrayValue, index) {
                        // Support selecting template as a function of the data being rendered
                        arrayItemContext = parentBindingContext['createChildContext'](ko.utils.unwrapObservable(arrayValue), options['as']);
                        arrayItemContext['$index'] = index;
                        var templateName = typeof (template) == 'function' ? template(arrayValue, arrayItemContext) : template;
                        return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
                    }

                    // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
                    var activateBindingsCallback = function (arrayValue, addedNodesArray, index) {
                        activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
                        if (options['afterRender'])
                            options['afterRender'](addedNodesArray, arrayValue);
                    };

                    return ko.dependentObservable(function () {
                        var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
                        if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
                            unwrappedArray = [unwrappedArray];

                        // Filter out any entries marked as destroyed
                        var filteredArray = ko.utils.arrayFilter(unwrappedArray, function (item) {
                            return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
                        });

                        // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
                        // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
                        ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);

                    }, null, { disposeWhenNodeIsRemoved: targetNode });
                };

                var templateComputedDomDataKey = '__ko__templateComputedDomDataKey__';
                function disposeOldComputedAndStoreNewOne(element, newComputed) {
                    var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
                    if (oldComputed && (typeof (oldComputed.dispose) == 'function'))
                        oldComputed.dispose();
                    ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
                }

                ko.bindingHandlers['template'] = {
                    'init': function (element, valueAccessor) {
                        // Support anonymous templates
                        var bindingValue = ko.utils.unwrapObservable(valueAccessor());
                        if ((typeof bindingValue != "string") && (!bindingValue['name']) && (element.nodeType == 1 || element.nodeType == 8)) {
                            // It's an anonymous template - store the element contents, then clear the element
                            var templateNodes = element.nodeType == 1 ? element.childNodes : ko.virtualElements.childNodes(element),
                                container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
                            new ko.templateSources.anonymousTemplate(element)['nodes'](container);
                        }
                        return { 'controlsDescendantBindings': true };
                    },
                    'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                        var templateName = ko.utils.unwrapObservable(valueAccessor()),
                            options = {},
                            shouldDisplay = true,
                            dataValue,
                            templateComputed = null;

                        if (typeof templateName != "string") {
                            options = templateName;
                            templateName = options['name'];

                            // Support "if"/"ifnot" conditions
                            if ('if' in options)
                                shouldDisplay = ko.utils.unwrapObservable(options['if']);
                            if (shouldDisplay && 'ifnot' in options)
                                shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);

                            dataValue = ko.utils.unwrapObservable(options['data']);
                        }

                        if ('foreach' in options) {
                            // Render once for each data point (treating data set as empty if shouldDisplay==false)
                            var dataArray = (shouldDisplay && options['foreach']) || [];
                            templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
                        } else if (!shouldDisplay) {
                            ko.virtualElements.emptyNode(element);
                        } else {
                            // Render once for this single data point (or use the viewModel if no data was provided)
                            var innerBindingContext = ('data' in options) ?
                                bindingContext['createChildContext'](dataValue, options['as']) :  // Given an explitit 'data' value, we create a child binding context for it
                                bindingContext;                                                        // Given no explicit 'data' value, we retain the same binding context
                            templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
                        }

                        // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
                        disposeOldComputedAndStoreNewOne(element, templateComputed);
                    }
                };

                // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
                ko.expressionRewriting.bindingRewriteValidators['template'] = function (bindingValue) {
                    var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);

                    if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
                        return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)

                    if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
                        return null; // Named templates can be rewritten, so return "no error"
                    return "This template engine does not support anonymous templates nested within its templates";
                };

                ko.virtualElements.allowedBindings['template'] = true;
            })();

            ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
            ko.exportSymbol('renderTemplate', ko.renderTemplate);

            ko.utils.compareArrays = (function () {
                var statusNotInOld = 'added', statusNotInNew = 'deleted';

                // Simple calculation based on Levenshtein distance.
                function compareArrays(oldArray, newArray, dontLimitMoves) {
                    oldArray = oldArray || [];
                    newArray = newArray || [];

                    if (oldArray.length <= newArray.length)
                        return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, dontLimitMoves);
                    else
                        return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, dontLimitMoves);
                }

                function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, dontLimitMoves) {
                    var myMin = Math.min,
                        myMax = Math.max,
                        editDistanceMatrix = [],
                        smlIndex, smlIndexMax = smlArray.length,
                        bigIndex, bigIndexMax = bigArray.length,
                        compareRange = (bigIndexMax - smlIndexMax) || 1,
                        maxDistance = smlIndexMax + bigIndexMax + 1,
                        thisRow, lastRow,
                        bigIndexMaxForRow, bigIndexMinForRow;

                    for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
                        lastRow = thisRow;
                        editDistanceMatrix.push(thisRow = []);
                        bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
                        bigIndexMinForRow = myMax(0, smlIndex - 1);
                        for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
                            if (!bigIndex)
                                thisRow[bigIndex] = smlIndex + 1;
                            else if (!smlIndex)  // Top row - transform empty array into new array via additions
                                thisRow[bigIndex] = bigIndex + 1;
                            else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
                                thisRow[bigIndex] = lastRow[bigIndex - 1];                  // copy value (no edit)
                            else {
                                var northDistance = lastRow[bigIndex] || maxDistance;       // not in big (deletion)
                                var westDistance = thisRow[bigIndex - 1] || maxDistance;    // not in small (addition)
                                thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
                            }
                        }
                    }

                    var editScript = [], meMinusOne, notInSml = [], notInBig = [];
                    for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
                        meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
                        if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex - 1]) {
                            notInSml.push(editScript[editScript.length] = {     // added
                                'status': statusNotInSml,
                                'value': bigArray[--bigIndex],
                                'index': bigIndex
                            });
                        } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
                            notInBig.push(editScript[editScript.length] = {     // deleted
                                'status': statusNotInBig,
                                'value': smlArray[--smlIndex],
                                'index': smlIndex
                            });
                        } else {
                            editScript.push({
                                'status': "retained",
                                'value': bigArray[--bigIndex]
                            });
                            --smlIndex;
                        }
                    }

                    if (notInSml.length && notInBig.length) {
                        // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
                        // smlIndexMax keeps the time complexity of this algorithm linear.
                        var limitFailedCompares = smlIndexMax * 10, failedCompares,
                            a, d, notInSmlItem, notInBigItem;
                        // Go through the items that have been added and deleted and try to find matches between them.
                        for (failedCompares = a = 0; (dontLimitMoves || failedCompares < limitFailedCompares) && (notInSmlItem = notInSml[a]) ; a++) {
                            for (d = 0; notInBigItem = notInBig[d]; d++) {
                                if (notInSmlItem['value'] === notInBigItem['value']) {
                                    notInSmlItem['moved'] = notInBigItem['index'];
                                    notInBigItem['moved'] = notInSmlItem['index'];
                                    notInBig.splice(d, 1);       // This item is marked as moved; so remove it from notInBig list
                                    failedCompares = d = 0;     // Reset failed compares count because we're checking for consecutive failures
                                    break;
                                }
                            }
                            failedCompares += d;
                        }
                    }
                    return editScript.reverse();
                }

                return compareArrays;
            })();

            ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);

            (function () {
                // Objective:
                // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
                //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
                // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
                //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
                //   previously mapped - retain those nodes, and just insert/delete other ones

                // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
                // You can use this, for example, to activate bindings on those nodes.

                function fixUpNodesToBeMovedOrRemoved(contiguousNodeArray) {
                    // Before moving, deleting, or replacing a set of nodes that were previously outputted by the "map" function, we have to reconcile
                    // them against what is in the DOM right now. It may be that some of the nodes have already been removed from the document,
                    // or that new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
                    // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
                    // So, this function translates the old "map" output array into its best guess of what set of current DOM nodes should be removed.
                    //
                    // Rules:
                    //   [A] Any leading nodes that aren't in the document any more should be ignored
                    //       These most likely correspond to memoization nodes that were already removed during binding
                    //       See https://github.com/SteveSanderson/knockout/pull/440
                    //   [B] We want to output a contiguous series of nodes that are still in the document. So, ignore any nodes that
                    //       have already been removed, and include any nodes that have been inserted among the previous collection

                    // Rule [A]
                    while (contiguousNodeArray.length && !ko.utils.domNodeIsAttachedToDocument(contiguousNodeArray[0]))
                        contiguousNodeArray.splice(0, 1);

                    // Rule [B]
                    if (contiguousNodeArray.length > 1) {
                        // Build up the actual new contiguous node set
                        var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
                        while (current !== last) {
                            current = current.nextSibling;
                            if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
                                return;
                            newContiguousSet.push(current);
                        }

                        // ... then mutate the input array to match this.
                        // (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
                        Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
                    }
                    return contiguousNodeArray;
                }

                function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
                    // Map this array value inside a dependentObservable so we re-map when any dependency changes
                    var mappedNodes = [];
                    var dependentObservable = ko.dependentObservable(function () {
                        var newMappedNodes = mapping(valueToMap, index) || [];

                        // On subsequent evaluations, just replace the previously-inserted DOM nodes
                        if (mappedNodes.length > 0) {
                            ko.utils.replaceDomNodes(fixUpNodesToBeMovedOrRemoved(mappedNodes), newMappedNodes);
                            if (callbackAfterAddingNodes)
                                ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
                        }

                        // Replace the contents of the mappedNodes array, thereby updating the record
                        // of which nodes would be deleted if valueToMap was itself later removed
                        mappedNodes.splice(0, mappedNodes.length);
                        ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
                    }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function () { return (mappedNodes.length == 0) || !ko.utils.domNodeIsAttachedToDocument(mappedNodes[0]) } });
                    return { mappedNodes: mappedNodes, dependentObservable: (dependentObservable.isActive() ? dependentObservable : undefined) };
                }

                var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";

                ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
                    // Compare the provided array against the previous one
                    array = array || [];
                    options = options || {};
                    var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
                    var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
                    var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
                    var editScript = ko.utils.compareArrays(lastArray, array);

                    // Build the new mapping result
                    var newMappingResult = [];
                    var lastMappingResultIndex = 0;
                    var newMappingResultIndex = 0;

                    var nodesToDelete = [];
                    var itemsToProcess = [];
                    var itemsForBeforeRemoveCallbacks = [];
                    var itemsForMoveCallbacks = [];
                    var itemsForAfterAddCallbacks = [];
                    var mapData;

                    function itemMovedOrRetained(editScriptIndex, oldPosition) {
                        mapData = lastMappingResult[oldPosition];
                        if (newMappingResultIndex !== oldPosition)
                            itemsForMoveCallbacks[editScriptIndex] = mapData;
                        // Since updating the index might change the nodes, do so before calling fixUpNodesToBeMovedOrRemoved
                        mapData.indexObservable(newMappingResultIndex++);
                        fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes);
                        newMappingResult.push(mapData);
                        itemsToProcess.push(mapData);
                    }

                    function callCallback(callback, items) {
                        if (callback) {
                            for (var i = 0, n = items.length; i < n; i++) {
                                if (items[i]) {
                                    ko.utils.arrayForEach(items[i].mappedNodes, function (node) {
                                        callback(node, i, items[i].arrayEntry);
                                    });
                                }
                            }
                        }
                    }

                    for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
                        movedIndex = editScriptItem['moved'];
                        switch (editScriptItem['status']) {
                            case "deleted":
                                if (movedIndex === undefined) {
                                    mapData = lastMappingResult[lastMappingResultIndex];

                                    // Stop tracking changes to the mapping for these nodes
                                    if (mapData.dependentObservable)
                                        mapData.dependentObservable.dispose();

                                    // Queue these nodes for later removal
                                    nodesToDelete.push.apply(nodesToDelete, fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes));
                                    if (options['beforeRemove']) {
                                        itemsForBeforeRemoveCallbacks[i] = mapData;
                                        itemsToProcess.push(mapData);
                                    }
                                }
                                lastMappingResultIndex++;
                                break;

                            case "retained":
                                itemMovedOrRetained(i, lastMappingResultIndex++);
                                break;

                            case "added":
                                if (movedIndex !== undefined) {
                                    itemMovedOrRetained(i, movedIndex);
                                } else {
                                    mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
                                    newMappingResult.push(mapData);
                                    itemsToProcess.push(mapData);
                                    if (!isFirstExecution)
                                        itemsForAfterAddCallbacks[i] = mapData;
                                }
                                break;
                        }
                    }

                    // Call beforeMove first before any changes have been made to the DOM
                    callCallback(options['beforeMove'], itemsForMoveCallbacks);

                    // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
                    ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);

                    // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
                    for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
                        // Get nodes for newly added items
                        if (!mapData.mappedNodes)
                            ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));

                        // Put nodes in the right place if they aren't there already
                        for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
                            if (node !== nextNode)
                                ko.virtualElements.insertAfter(domNode, node, lastNode);
                        }

                        // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
                        if (!mapData.initialized && callbackAfterAddingNodes) {
                            callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
                            mapData.initialized = true;
                        }
                    }

                    // If there's a beforeRemove callback, call it after reordering.
                    // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
                    // some sort of animation, which is why we first reorder the nodes that will be removed. If the
                    // callback instead removes the nodes right away, it would be more efficient to skip reordering them.
                    // Perhaps we'll make that change in the future if this scenario becomes more common.
                    callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);

                    // Finally call afterMove and afterAdd callbacks
                    callCallback(options['afterMove'], itemsForMoveCallbacks);
                    callCallback(options['afterAdd'], itemsForAfterAddCallbacks);

                    // Store a copy of the array items we just considered so we can difference it next time
                    ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
                }
            })();

            ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
            ko.nativeTemplateEngine = function () {
                this['allowTemplateRewriting'] = false;
            }

            ko.nativeTemplateEngine.prototype = new ko.templateEngine();
            ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
                var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
                    templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
                    templateNodes = templateNodesFunc ? templateSource['nodes']() : null;

                if (templateNodes) {
                    return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
                } else {
                    var templateText = templateSource['text']();
                    return ko.utils.parseHtmlFragment(templateText);
                }
            };

            ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
            ko.setTemplateEngine(ko.nativeTemplateEngine.instance);

            ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
            (function () {
                ko.jqueryTmplTemplateEngine = function () {
                    // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
                    // doesn't expose a version number, so we have to infer it.
                    // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
                    // which KO internally refers to as version "2", so older versions are no longer detected.
                    var jQueryTmplVersion = this.jQueryTmplVersion = (function () {
                        if ((typeof (jQuery) == "undefined") || !(jQuery['tmpl']))
                            return 0;
                        // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
                        try {
                            if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
                                // Since 1.0.0pre, custom tags should append markup to an array called "__"
                                return 2; // Final version of jquery.tmpl
                            }
                        } catch (ex) { /* Apparently not the version we were looking for */ }

                        return 1; // Any older version that we don't support
                    })();

                    function ensureHasReferencedJQueryTemplates() {
                        if (jQueryTmplVersion < 2)
                            throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
                    }

                    function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
                        return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
                    }

                    this['renderTemplateSource'] = function (templateSource, bindingContext, options) {
                        options = options || {};
                        ensureHasReferencedJQueryTemplates();

                        // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
                        var precompiled = templateSource['data']('precompiled');
                        if (!precompiled) {
                            var templateText = templateSource['text']() || "";
                            // Wrap in "with($whatever.koBindingContext) { ... }"
                            templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";

                            precompiled = jQuery['template'](null, templateText);
                            templateSource['data']('precompiled', precompiled);
                        }

                        var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
                        var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);

                        var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
                        resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work

                        jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
                        return resultNodes;
                    };

                    this['createJavaScriptEvaluatorBlock'] = function (script) {
                        return "{{ko_code ((function() { return " + script + " })()) }}";
                    };

                    this['addTemplate'] = function (templateName, templateMarkup) {
                        document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "</script>");
                    };

                    if (jQueryTmplVersion > 0) {
                        jQuery['tmpl']['tag']['ko_code'] = {
                            open: "__.push($1 || '');"
                        };
                        jQuery['tmpl']['tag']['ko_with'] = {
                            open: "with($1) {",
                            close: "} "
                        };
                    }
                };

                ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();

                // Use this one by default *only if jquery.tmpl is referenced*
                var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
                if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
                    ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);

                ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
            })();
        });
    })(window, document, navigator, window["jQuery"]);
})();